the hottest stars show little evidence of hydrogen in their spectra because hydrogen is mostly ionized in the stars temperatures. true or false
Answers
True, the hottest stars show little evidence of hydrogen in their spectra because hydrogen is mostly ionized at the high temperatures found in these stars.
The hottest stars, also known as O-type stars, show little evidence of hydrogen in their spectra because hydrogen is mostly ionized at the high temperatures found in these stars. O-type stars have surface temperatures of around 30,000 kelvin, which is hot enough to ionize hydrogen atoms and strip them of their electrons. As a result, the spectral lines that are normally associated with neutral hydrogen atoms, such as the Balmer series, are very weak or even absent in the spectra of O-type stars. Instead, these stars show strong spectral lines associated with ionized elements, such as helium, nitrogen, oxygen, and silicon, which are produced by the high temperatures and intense radiation fields found in these stars.
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The correct answers for the statement ''the hottest stars show little evidence of hydrogen in their spectra because hydrogen is mostly ionized in the stars temperatures'' is True.
The hottest stars have such high temperatures that the majority of the hydrogen atoms in their atmospheres are ionized, meaning they have lost their electrons. When this happens, the hydrogen atoms no longer absorb or emit light at the same wavelengths as neutral hydrogen atoms.
As a result, there is little evidence of hydrogen in the spectra of these stars. Instead, other elements that are present in the stars, such as helium and carbon, produce the dominant spectral lines. This is why the spectra of hot stars look very different from those of cooler stars, which have more neutral hydrogen in their atmospheres.
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Related Questions
The countries shown on the map represent what supranational organization?
A. NATO
B. the European Union
C. NAFTA
D. USMCA
E. the United Nations
Answers
Answer: The United Nations
Explanation: NATO includes the UK, this map doesn't. NAFTA and USMCA are both North American organizations involving America, Mexico, and Canada, the European Union doesn't include the Balkan countries like Serbia in any capacity.
Hope this helps <3
The graph shows the altitude of the Sun for a 24-house
a certain day of the year at four different latitude
)
Altitude of the Sun at Four Different Latitudes
90
80
$23,
70
60
50
ube
Altitude of the Sun (degrees)
40
30
20
10
0
midnight
2
3
5
6
7
8 9 10 11 1
noon
2 3 4 5 6 7 8 9 10 11
midnight
am
Hour of the Day
pm
12. Identify the date represented by the data shown on the
graph. [1]
Fin
sh
Answers
Answer:
40 I also learnt it In science
two reasons why on the equator it is warmer then the South-or Northpole
Answers
Answer:
gvcgfhfhfjtoyoyoyoyogofjv
Which of the following is an example of absolute location? *
Answers
Answer:
location
Explanation:
the location is the absolute location
Example of absolute location is the location based on "earth's latitudes and longitudes, for example the location of the U.S. Capitol is 38° 53′ 35″ N latitude, 77° 00′ 32″ W longitude."
What is absolute location?Absolute location refers to a place on the Earth's surface based on specific geographic coordinates, such as latitude and longitude. For example, the Empire State Building is located at 40.7 degrees north (latitude), 74 degrees west (longitude).
What is Latitude and Longitude?Latitude and longitude are imaginary lines through which we describe the location of any place on Earth.
Latitudes run in an east-west direction across Earth, whereas Longitudes run in a north-south direction.
Hence, the example for absolute location is of the U.S. Capitol in latitude and longitude is 38° 53′ 35″ N, 77° 00′ 32″ W
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Restate the Question into a statement.
How can Agricultural Farming help sustain the future?
Answers
What are the most common push factors when considering immigration to Canada? Include the source(s) you used.
Answers
The most common push factors when considering immigration to Canada are economic opportunities, political instability, and social unrest in their home country.
What do the statistics show?According to a report by Statistics Canada, the majority of immigrants to Canada cite economic reasons as their primary motivation for moving to Canada.
This is often due to a lack of job opportunities, low wages, or limited access to education in their home country. Additionally, political instability and social unrest can also motivate individuals to seek refuge in Canada.
Factors such as war, persecution, and discrimination can make it unsafe for individuals to remain in their home country.
Therefore, Canada's stable political climate, strong economy, and welcoming immigration policies make it a desirable destination for many immigrants.
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··this is for EDGENUIT2020 here is the answer i really need t please π
ahhhhhhhhhh When too many fertilizers enter a body of water, an uncontrolled growth of algae may result. The algae consume all of the dissolved oxygen, killing marine life. This is called __________.
A.
ozone pollution
B.
acid rain
C.
eutrophication
D.
toxic spillage
Answers
NUMBER 8 PLEASE ANSWER IT ASAP AND WITH COMPLETE SOLUTION!!!
Moist air undergoes a heating and humidification process at a pressure of 101.325 kPa from an initial state of 15°C db and 80% relative humidity to a final state at 22ºC and 60% relative humidity. If the mass flow rate of the air at the initial state is 27.7 kg da/s, what is the increase in the water content of the air? Express your answer in kg/s. In your written solution, draw the process in the psychrometric chart, show the initial and final state and the values obtained from the chart.
Answers
If the mass flow rate of the air at the initial state is 27.7 kg da/s , then the increase in the water content of the air is -0.039648 kg/s.
How to find?The process can be drawn on a psychrometric chart as shown below:
In order to solve the problem, the following steps are to be followed:
Step 1: Find the Humidity Ratio at state 1
The Humidity Ratio (ω1) can be found using the formula:
\(Relative Humidity (RH1) = (ω1/ωsat) × 100\)
Where,
ω1 = Humidity Ratio at State 1
ωsat = Saturation Humidity Ratio at State 1
The value of saturation humidity ratio (ωsat) can be obtained from the psychrometric chart.
ωsat at State 1 corresponds to temperature T1 and 100% relative humidity.
From the chart,ωsat = 0.012 kg water/kg dry air.
Therefore,
RH1 = (ω1/ωsat) × 100
80% = (ω1/0.012) × 100ω1
= (80/100) × 0.012
= 0.0096 kg water/kg dry air.
Step 2: Find the Humidity Ratio at state 2The Humidity Ratio (ω2) can be found using the formula:
RH2 = (ω2/ωsat2) × 100
From the chart,ωsat2 = 0.0136 kg water/kg dry air.
Therefore,
RH2 = (ω2/ωsat2) × 10060%
= (ω2/0.0136) × 100ω2
= (60/100) × 0.0136
= 0.00816 kg water/kg dry air.
Step 3: Find the increase in Humidity Ratio
Increase in Humidity Ratio \((Δω) = ω2 - ω1Δω\)
= 0.00816 - 0.0096
= -0.00144 kg water/kg dry air.
The negative sign indicates that there is a decrease in the water content of the air.
Step 4: Find the Mass flow rate of water
Mass flow rate of water can be found using the formula:
Mass flow rate of water = Mass flow rate of dry air x ΔωMass flow rate of water
= 27.7 x (-0.00144)
= -0.039648 kg/s.
Therefore, the increase in the water content of the air is -0.039648 kg/s.
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Droughts have become a serious threat in southern africa. Outline the causes and effects of droughts on this region. Suggest management strategies to prevent or minimize the effects of droughts
Answers
Droughts in Southern Africa are predominantly caused by natural climate variability, such as El Niño and La Niña events, as well as long-term climate change.
These factors lead to a reduction in rainfall and prolonged periods of dry conditions. Additionally, human activities like deforestation, overgrazing, and unsustainable water management practices can exacerbate the impacts of droughts.
The effects of droughts in Southern Africa are significant and wide-ranging. They include:
Agricultural Impacts: Droughts result in crop failure, livestock deaths, and reduced agricultural productivity. This leads to food shortages, malnutrition, and loss of livelihoods for farmers.
Water Scarcity: Droughts cause reduced water availability, leading to water shortages for both domestic and industrial use. This affects sanitation, hygiene, and access to clean drinking water.
Ecological Consequences: Droughts negatively impact ecosystems, leading to the degradation of natural habitats, loss of biodiversity, and increased vulnerability of wildlife.
Socioeconomic Challenges: Droughts contribute to economic decline, unemployment, poverty, and increased migration as people search for better living conditions.
To prevent or minimize the effects of droughts, the following management strategies can be implemented:
Water Conservation: Promote water-saving practices, such as rainwater harvesting, efficient irrigation systems, and water reuse/recycling.
Diversification of Water Sources: Develop alternative water sources, such as desalination plants, groundwater extraction, and water storage infrastructure (dams and reservoirs).
Sustainable Agriculture: Encourage the use of drought-resistant crops, agroforestry practices, and efficient irrigation techniques to minimize water usage in agriculture.
Reforestation and Ecosystem Restoration: Restore and protect forests and other natural ecosystems to enhance water retention, regulate local climates, and mitigate the impacts of droughts.
Climate Change Adaptation: Implement strategies to adapt to the long-term impacts of climate change, such as promoting sustainable land management, improving early warning systems, and enhancing resilience in vulnerable communities.
Public Awareness and Education: Raise awareness about the causes and impacts of droughts, and educate communities on water conservation, sustainable practices, and disaster preparedness.
It is crucial to adopt an integrated approach involving government, communities, and international cooperation to effectively manage and mitigate the effects of droughts in Southern Africa.
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2. Define the words below
Prime Meridian:
Equator:
Hemisphere:
Region:
Continent:
Nation:
Answers
Equator: Earths latitude of zero that divides the earth into northern and Southern Hemispheres
Hemisphere: A half of the celestial sphere (Earth) divided in two halves by the equator or horizon
Region: An area or part of a country with definable characteristics but not always fixed boundaries
Continent: Any of the earth’s main continuous expanses of land
Nation: A large body of people United by a common descent inhabiting a particular territory
What ancient civilization was destroyed by a volcan?
Answers
How are the plate boundaries in Iceland and Chile similar? How are they different?
Answers
The way that plate boundaries in Iceland and Chile similar is that both are have volcanoes and Earthquakes. The way that they are different is that Iceland is one that lies in the Mid-Atlantic Ridge while that of Chile is in the convergent plate boundary.
What type of plate boundary is the island of Iceland?Iceland is situated on the Mid Atlantic Ridge, a divergent plate boundary where the Eurasian Plate and North American Plate are moving apart. Magma or molten rock rises to the surface and erupts as lava to form new ocean crust as the plates separate.
Two tectonic plates can diverge from one another, creating a border. As magma rises from the Earth's mantle to the surface and solidifies to form new oceanic crust, earthquakes frequently occur along these boundaries.
Chile is located on top of the South American tectonic plate, along with the other nations of the continent. The Nazca Plate joins the Pacific Plate at a divergent plate boundary known as the East Pacific Rise to the west of Chile. This region is beneath the Pacific Ocean.
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Based on current birth and death rates, by 2050 Europe’s population will be larger than it is today.
Answers
Answer:
False
Explanation:
Answer:
false
Explanation:
edge 2022
Select the correct answer. Along with Earth’s crust, which portion of the upper mantle forms the lithosphere? A. cooler, more rigid outer portion B. hotter, liquid-like inner portion C. cooler, liquid-like inner portion D. hotter, more rigid outer portion
Answers
The correct answer is option A, that is, cooler and more rigid outer portion.
The lithosphere of the Earth comprises the crust and the uppermost mantle that forms the rigid and hard outer layer of the Earth. The lithosphere is sub-differentiated into tectonic plates. The topmost section of the lithosphere, which chemically reacts with the hydrosphere, atmosphere, and biosphere via the soil producing procedure is known as the pedosphere. The lithosphere is situated above the asthenosphere that is the hotter, weaker, and deeper component of the upper mantle.
Helppp, I rlly need help w this
Answers
Answer:
answer
Explanation:
w d
Answer:
20 and 40
Explanation:
each line is adding 20. So, 20, 40, 60, 80, 100 etc.
Soil composition and horizons vary depending on climate. Please select the best answer from the choices provided T F
Answers
True. Soil composition and horizons are influenced by climate. Climate factors such as temperature, precipitation, and vegetation cover impact the processes of soil formation, resulting in different soil compositions and horizons.
In more detail, climate affects soil composition through its influence on weathering processes. In warm and humid climates, chemical weathering is more prominent, leading to the breakdown of minerals and the formation of clay-rich soils. In contrast, in cold and dry climates, physical weathering processes like freeze-thaw cycles and wind erosion dominate, resulting in coarser-textured soils with lower clay content. Additionally, the amount and distribution of precipitation affect leaching processes, which can remove or accumulate certain elements and minerals in the soil.
Climate also influences the development of soil horizons. Soil horizons are distinct layers or zones in the soil profile that have unique characteristics. In regions with high rainfall, there is a greater leaching of nutrients and minerals from the upper horizons, leading to the development of a distinct leached horizon (E horizon) below the surface. In arid regions, where evaporation rates are high, minerals and salts can accumulate in the upper horizons, forming a distinct horizon known as a caliche (Bk horizon).
Overall, climate plays a crucial role in shaping soil composition and horizons by influencing weathering processes, leaching, and the accumulation or depletion of minerals and organic matter. Understanding these climate-soil relationships is essential for various applications, including agriculture, land management, and environmental assessments.
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what is the relationship between the carrying capacity and productivity of an ecosystem
Answers
how are levels of economic activities connected to a regions level of development Be sure to provide examples of primary secondary tertiary and quaternary activities and how they are related to development.
Answers
Economic activities which includes effective trading patterns influence all country's level of development.
Countries such as China, France, United States, Japan are addressed as developed countries with sound economy because of their Modern industrial societies which brought fortunes to their revenue coffers.M
There are four type of economic activities:
Primary activities: its involves the extracting, mining, farming, fishing etc activities. Secondary activities: Its involves manufacturing and production of goods such as making cars, steel etc Tertiary activities: Its involves providing a service such as teaching, medicine, nursing etcQuaternary activities: Its involves research and development industries which aims at improving the other three activities.Therefore, countries with these effective economic activities will have a developing economic system which will be influential in world.
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How would you compare a ant and a deer based on their ecosystem
Answers
Answer:
This species can use a wide variety of habitats, including forests, open grasslands, agricultural fields, wetlands and suburban land. Typically, white- tailed deer thrive in areas made up of a mosaic of early to late successional forests as well as scrub-shrub meadows.
Explanation:
This is the deer one sorry I couldn't answer the ant one.
Answer:
i dunno
Explanation:
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if it's winter in the northern hemisphere what season is it in the southern?
Answers
Answer:
The seasons in the Northern Hemisphere are the opposite of those in the Southern Hemisphere. This means that in Argentina and Australia, winter begins in June. The winter solstice in the Southern Hemisphere is June 20 or 21, while the summer solstice, the longest day of the year, is December 21 or 22.
Explanation:
Answer:
summer
Explanation:
the seasons experienced by the northern and southern hemisphere always different by six months so when it is winter in northern hemisphere , it is summer in southern hemisphere
and so on
Human geography is the study of _______.
A. Human societies and culture
B. Mapmaking
C. Ancient cultures and how they have evolved over time
D. Earth's natural features and how they have changed over time
Answers
Answer:
a
Explanation:
Answer:
A
Explanation:
What two water issues are the UK facing??
GiveTwo factors that influence your food security..
What is the name of the agribusiness found in East Kent?
Answers
I have no answer just some help
The first water issue is from climate change which is taking away some water from UK, the other water issue is drought.
trenches and island arcs are found at spreading centers.
Answers
Trenches and island arcs are NOT found at spreading centers but are instead found at subduction zones.
A trench is a deep V-shaped valley that forms when one lithospheric plate is forced under another at a subduction zone. On the other hand, an island arc is a curved chain of volcanic islands that forms on the overriding plate near a subduction zone.
Trenches are deep, elongated depressions on the seafloor that form at subduction zones, which are convergent plate boundaries where one plate is forced beneath another. The subducting plate descends into the mantle, creating a trench on the ocean floor. Examples of trenches include the Mariana Trench in the western Pacific Ocean and the Peru-Chile Trench along the western coast of South America.
Island arcs, on the other hand, are curved chains or clusters of volcanic islands that form parallel to and above subduction zones. They are created by volcanic activity resulting from the melting of the subducting plate as it descends into the mantle. The Aleutian Islands in Alaska and the Japanese archipelago are examples of island arcs.
Spreading centers, also known as divergent plate boundaries, occur where tectonic plates are moving apart. These regions are characterized by volcanic activity, but the volcanoes formed at spreading centers are typically shield volcanoes rather than island arcs. Additionally, spreading centers can lead to the formation of mid-ocean ridges, where new oceanic crust is generated as magma rises to the surface and solidifies.
In summary, trenches and island arcs are associated with convergent plate boundaries, while spreading centers are characterized by volcanic activity and the formation of mid-ocean ridges.
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what are you doing?
Answers
Answer:
nothing great wbu.....
What are some downside of human connection?
Answers
Answer:
being too connected could lead to a kind of cultural lock in where societies are oblivious to the existence of other ideas that could improve their fate
The dashed lines labeled "B" on the accompanying figure are known as
corange lines
Coriolis lines
declination lines
Answers
Answer: Corange Lines
Explanation:
The dashed lines labeled "B" on the accompanying figure are known as Coriolis lines. The correct option is B.
Why is it called the Coriolis effect?In honor of French mathematician and physicist Gaspard-Gustave de Coriolis, the Coriolis Effect was given that name. It has an impact on everything from weather patterns to ocean currents to aviation transport. Even though the Coriolis Effect is significant, few people are aware of it, and even fewer actually comprehend it.
The Coriolis effect, a phenomenon brought on by the rotation of the Earth and affecting the motion of things on the planet's surface, is indicated by imaginary lines on a map called "Coriolis lines," which show the direction of the influence. Coriolis lines, often referred to as deflective or inertial lines, are used to forecast how air and water masses will move in the atmosphere and oceans.
Thus, the ideal selection is option B.
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Cloud Formation Clouds are formed when air (made of nitrogen gas and oxygen gas) containing water vapor cools slightly. Some of the water can condense upon solid dust particles be asked to draw a particle-level diagram of a cloud. 14 points Draw a particulate-level picture of a cloud made up of four droplets and upload it to this question. Use the description above to draw the cloud. A complete drawing should include: - Water and dust particles with a label so I can see which is which Feel free to use colors/shapes/labels so that I can tell the particles apart You are free to add more types of particles as you see fit, but make sure they're labeled! - Four droplets that follow the description above - Water vapor in the air around the droplets - Particle representation of solids/liquids/gases as appropriate - Make sure I can easily tell whether the particles I'm looking at are solids/liquids/gases
Answers
The cloud consists of air molecules (N2 and O2) with water vapor molecules (H2O) surrounding four droplets (D1, D2, D3, D4) formed by the condensation of water vapor onto solid dust particles (labeled Dust).
The cloud consists of air molecules (represented by small circles) made up of nitrogen gas (labeled N2) and oxygen gas (labeled O2). There are water vapor molecules (labeled H2O) present in the air surrounding the cloud particles. The cloud contains four droplets (labeled D1, D2, D3, and D4) formed by the condensation of water vapor onto solid dust particles (labeled Dust). The droplets should be larger than the individual water vapor molecules to represent their condensed state. The remaining water vapor molecules in the air are not yet condensed into droplets.
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similarities and differences between Sunni and Shia Islam
Answers
Answer:
sunni beleive that Mohammad pbuh is the messenger and shia beleive its his cousin
the problem 24 placemark points to a prominent flatiron of triassic shinarump conglomoerate on a fold limb. what name best describes the overall fold?
Answers
NE plunging Anticline best describes the overall fold. The plunge is in the NE direction if you declared that fold f2 is a plunging fold.
Based on the relative ages of the folded rock layers, the terms "Syncline" and "Anticline" are used to describe folds. The youngest rocks are in the fold's core in a syncline, while the oldest rocks are in the core of an anticline. An anticline is a type of fold that looks like an arch. This should be noted.
The oldest rocks make up the core of an anticlinal fold, and the limbs dip away from the core. In point of fact, in contrast to the syncline, which has the opposite effect, an anticlinal fold has an elevated axis in relation to the limbs.
DISCLAIMER The question is incomplete.
the problem 24 placemark points to a prominent flatiron of triassic shinarump conglomoerate on a fold limb. what name best describes the overall fold?
Image is given below
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Which of the following lists of properties best describes nonmetals?
A.Brittle, shiny, conductor
B.Malleable, shiny, conductor
C.Malleable, dull, insulator
D.Brittle, dull, insulator
Answers
Answer:
d
Explanation:
d has all the properties of non metals