potassium can emit photoelectrons when struck by blue light, whereas tungsten requires ultraviolet radiation to emit photoelectrons. which statement is true?
Answers
It is true that no photoelectrons are released when ultraviolet radiation strikes a surface.
Which metal only emits electrons in response to UV light?It was discovered that certain metals, such as zinc, cadmium, magnesium, etc., only emitted electrons from their surfaces when exposed to ultraviolet light with a short wavelength. Lithium, sodium, potassium, caesium, and rubidium are examples of alkali metals that can be sensitive to visible light.
Why don't photoelectrons release?If the frequency of the light is less than a specific level, no photoelectrons are released. The threshold frequency is referred to as such. For many materials, the threshold frequency varies. Alkali metals, calcium, and barium lose their photoelectron content when exposed to visible light.
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Related Questions
what is ultrasound ?
Answers
An ultrasound is a scan of a pregnant womens stomach, to see the baby. Typically they do this to see if the baby is healthy and okay.
If an imaginary line segment is drawn between the centers of the earth and the moon, then the net gravitational force F acting on an object situated on this line segment is F=(-K)/(x^(2))+(0.012K)/((239-x)^(2)) thousand miles
Answers
The net gravitational force acting on an object situated on this line segment is greatest at a distance of 119.5 thousand miles from the center of the earth.
If an imaginary line segment is drawn between the centers of the earth and the moon, then the net gravitational force F acting on an object situated on this line segment is given by F=(-K)/(x^(2))+(0.012K)/((239-x)^(2)) thousand miles, where K is a constant of proportionality that depends on the masses of the earth and moon, and x is the distance in thousands of miles from the center of the earth to the object.
The gravitational force acting on an object situated on this line segment is determined by the distances of the object from the centers of the earth and moon.
As the object moves away from the earth and closer to the moon, the gravitational force increases, and as it moves closer to the earth and farther from the moon, the gravitational force decreases.
The net gravitational force acting on an object situated on this line segment is the sum of the gravitational forces due to the earth and moon.
Since the gravitational force due to the earth is inversely proportional to the square of the distance from the center of the earth, while the gravitational force due to the moon is inversely proportional to the square of the distance from the center of the moon, the net gravitational force is given by the equation F=(-K)/(x^(2))+(0.012K)/((239-x)^(2)) thousand miles.The maximum value of the net gravitational force occurs at x=119.5 thousand miles.
At this distance, the net gravitational force is F=0.036K thousand miles.
As the object moves away from this distance, the net gravitational force decreases, and as it moves closer to this distance, the net gravitational force increases.
Thus, At a distance of 119.5 thousand miles from the earth's centre, the net gravitational force exerted on an item along this line segment is the strongest.
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You are gardening in the peak of summer, it hasn't rained in a week, and your plants are looking rough. You decide to water the plants for an hour. The next day you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. With what you know from class, please try and explain what is happening to your plants.
Answers
In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.
However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.
It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.
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What happens to the compass needle as you move the compas
around the magnet?
Answers
Answer:
When you moved the compass near a bar magnet, the needle pointed toward the magnet's magnetic field and not toward the north.
Explanation:
what is the average velocity of a trolley that starts from rest and acquires a final velocity of 19 m/s?
Answers
Where u = intital velocity, V = final velocity and
A= acceleration.
V = 0+ (2)*(4)= 8 m/s.
A squirrel standing on a branch shoots an acorn toward a hole in the tree. To determine how the potential energy of the acorn changes in relation to the earth, the position of what two objects must be considered?
a
The position of the acorn and the earth
b
The height of the branch and the position of the acorn
c
The position of the acorn and the width of the hole in the tree
d
The position of the squirrel on the branch and the earth
Answers
The positions to be considered are the position of the acorn and the earth.
What is potential energy?The potential energy is the energy that is possessed by a body by virtue of its position. Hence, the potential energy of a body changes as its position changes.
Hence, to determine how the potential energy of the acorn changes in relation to the earth, the positions to be considered are the position of the acorn and the earth.
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Please help me with this!
Neptune
What is the orbit of the Neptune?
Is the Sun at the center of the Nepturn’s orbit?
Describe the motion of Neptune throughout its orbit? Does it move at constant speed?
Click on each highlighted section and record the area. What do you notice about each area?
Click on the “Toggle Major Axes” button. Record any observation regarding the perihelion distance (Rp) and the aphelion distance (Ra).
Answers
What is the orbit of the Neptune? Orbital period 165 years
Is the Sun at the center of the Neptune's orbit? Neptune orbits our Sun, a star, and is the eighth planet from the Sun at a distance of about 2.8 billion miles (4.5 billion kilometers)
Describe the motion of Neptune throughout its orbit? Does it move at constant speed? One day on Neptune takes about 16 hours (the time it takes for Neptune to rotate or spin once). And Neptune makes a complete orbit around the Sun (a year in Neptunian time) in about 165 Earth years (60,190 Earth days). Sometimes Neptune is even farther from the Sun than dwarf planet Pluto.
Click on each highlighted section and record the area. What do you notice about each area? Unable to answer as no picture was provided
Click on the “Toggle Major Axes” button. Record any observation regarding the perihelion distance (Rp) and the aphelion distance (Ra). Unable to answer as no picture was provided
I hope the ones I could answer help.
A 1200 kg car collides with a 160 kg deer (don't worry, the deer survives and goes on to cause several more car crashes). The collision results in an acceleration ("deceleration") of 2.5 m/(sec)^2 for the car. Find the acceleration of the deer during the collision.
Answers
Answer:
18.75
Explanation:
p=mv, where p is momentum, m is mass, and v is velocity. For the car:
p=1200*2.5=3000
For the deer:
3000=160*v
v=18.75m/s
Hope this helps!
  do batteries produce or make energy
Answers
Answer:
Batteries are intended to store chemical energy and then it converts into electricidal energy. So overall, batteries produce energy.
Explanation:
The image I've attached holds the question.What is the satellite’s speed?Answer in units of m/s.What is the period of the satellite’s orbit?Answer in units of h.
Answers
Given:
The gravitational constant, G=6.67259×10⁻¹¹ N·m²/kg⁻²
The mass of the moon, M=7.36×10²² kg
The radius of the orbit of the satellite, R=955.2 km=955.2×10³ m
To find:
1. Satellite's speed.
2. The period of satellite.
3. The acceleration of the satellite.
Explanation:
1.
The gravitational force applied by the moon on the satellite provides the satellite with the centripetal force that is neccessary for the satellite to orbit the moon.
Thus,
\(\begin{gathered} F_c=F_g \\ \frac{mv^2}{R}=\frac{GMm}{R^2} \\ v=\sqrt{\frac{GM}{R}} \end{gathered}\)Where F_c is the centripetal force, F_g is the gravitational force, and v is the orbital velocity of the satellite.
On substituting the known values,
\(\begin{gathered} v=\sqrt{\frac{6.67259\times10^{-11}\times7.36\times10^{22}}{955.2\times10^3}} \\ =2267.46\text{ m/s} \end{gathered}\)2.
The orbital period of the satellite in seconds is given by,
\(T=\frac{2\pi R}{v}\)Thus the period of the satellite in hours is given by,
\(T=\frac{2\pi R}{v\times3600}\)On substituting the known values,
\(\begin{gathered} T=\frac{2\pi\times955.2\times10^3}{2267.46\times3600} \\ =0.74\text{ hr} \end{gathered}\)3.
The acceleration of the satellite is given by,
\(a=\frac{v^2}{R}\)On substituting the known values,
\(\begin{gathered} a=\frac{2267.46^2}{955.2\times10^3} \\ =5.38\text{ m/s}^2 \end{gathered}\)Final answer:
1. The orbital velocity of the satellite is 23267.46 m/s
2. The period of the satellite is 0.74 hr
3. The acceleration of the satellite is 5.38 m/s²
the student measures the length of half a wavelength using a ruler. describe how she could use this measurement and information from the signal generator to calculate the speed of the wave on the string
Answers
Answer:
read section b :)
Explanation:
To measure the speed of the wave on the string, the wavelength, and frequency are required. So by calculating the wavelength, the speed can be calculated.
What is wavelength?The distance between two adjacent crests can be used to calculate a transverse wave's wavelength. The distance between two adjacent compressions can be used to calculate the wavelength of a longitudinal wave.
The wave speed can be determined using this equation if the wavelength and frequency are known. The quantity of waves that move in a wave's frequency is measured in waves per second.
Speed = Wavelength x Frequency).
Therefore, the wavelength and frequency of the wave on the string must be determined in order to calculate its speed. Consequently, the speed can be estimated by determining the wavelength.
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John can travel 567 meters to his house in 540 seconds. What is his velocity? Give the
answer to two decimal places.
Answers
Answer:1.05m/s
Explanation:
we know that V=s/t
s=567m
t=540s
so, v=567/548=1.05m/s
Newtonís third law states that for every action, there is a reaction. Which of the following accurately restates this law?
A.If object A exerts a force on object B, then object B always exerts a force back on A. The object with the greater mass exerts a greater force
B.If object A exerts a force on object B, then object B always exerts a force back on A. The object with the greater acceleration exerts a greater force
C.If object A exerts a force on object B, then object B always exerts a force back on A The two forces are equal in magnitude, but opposite in direction to each other.
D.If object A exerts a force on object B, then object B always exerts a force back on A. The object with the greater mass and acceleration exerts a greater force.
Answers
Answer:B
Explanation:
The answer would be B because Answer B exerts a force which has a reaction.
significant figures, or 'sig figs' for short, are important for understanding the precision of a measurement device. if a measurement device, such as a speed sensor, measures 12.34 m/s, how many sig figs does that measurement contain?
Answers
The speed is given as 12.34 m/s. It contains 4 number of significant figures or sig figs.
The speed sensor measures the speed as 12.34 m/s.
The initial uncertain or estimated digit and all the digits known with certainty are referred to as the important figures of a measured amount. The first unknown digit is the last digit recorded in a measurement since it makes no sense to report any additional digits after it. When necessary, zeros are utilised to position the important figures correctly.
From the rules for deciding which digits in a measurement are significant, it is said that all non-zero digits in a measurement are significant.
12.34 m/s - contains all non-zero digits
Thus, it contains 4 sig figs.
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Students are provided with data in which an experiment was conducted to determine the relationship between the length of the pendulum and the period of oscillation. the data include a pendulum of length 0.5m , for which it took 81 s for the pendulum bob to oscillate 10 times. however, the experiment was conducted at a location that is not near earth’s surface. the gravitational field strength where the experiment was conducted is most nearly:__________
Answers
The gravitational field strength at the location where the experiment was conducted is nearly 1.56 m/s².
In the given experiment, the length of the pendulum is 0.5m, and it took 81 seconds for the pendulum bob to oscillate 10 times.
Use of the relationship between the length of the pendulum and its period of oscillation.
The period of a simple pendulum is given by the formula:
T = 2π\(\sqrt{(L/g)}\)
Where:
T = period of the pendulum
L = length of the pendulum
g = gravitational field strength
g = (4π²L) / T²
Substituting the given values:
g = (4π² × 0.5) / (81/10)²
= 1.56 m/s²
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Choose a place anywhere in the philippines and determine its location in terms of longitude and latitude
Answers
Location of Boracay Island, Philippines:
Latitude 11.9674° N, Longitude 121.9247° E.
Boracay Island is a small island located in the Western Visayas region of the Philippines. It is known for its stunning white sand beaches and crystal-clear waters, making it a popular tourist destination. The island is situated approximately 315 kilometers south of Manila and is accessible by a 1-hour flight from Manila to Caticlan, followed by a short boat ride to the island. Boracay Island covers an area of approximately 10.32 square kilometers and is home to a population of around 32,000 people. The island has a tropical climate with an average temperature of 28°C, making it an ideal destination for tourists looking to escape the cold weather.
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WILL RATE! You sit in between two speakers located 25 feet apart which are emitting the same sound in phase. You observe that when you are 5 feet from the left speaker and 20 feet from the right speaker, the sound you hear is at a minimum intensity.
Which of the following could NOT be the wavelength λ of the sound waves produced by the speakers?
Group of answer choices
25 feet
30 feet
10 feet
All of these are possible wavelengths
6 feet
Answers
The wavelength that could NOT be produced by the speakers is 30 feet.
To determine which wavelength could not be produced, consider the path difference between the two speakers. When you are 5 feet from the left speaker and 20 feet from the right speaker, the path difference is 15 feet (20 - 5).
For the sound intensity to be at a minimum, the path difference must be an odd multiple of half the wavelength (λ/2). So, the equation to solve is:
15 = (λ/2) * (2n + 1)
Where n is an integer. Evaluating this equation for each wavelength option:
- For 25 feet, n = 1, so the equation is true
- For 30 feet, there is no integer value of n that satisfies the equation
- For 10 feet, n = 1, so the equation is true
- For 6 feet, n = 2, so the equation is true
Therefore, a 30-foot wavelength could NOT be produced by the speakers.
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In a closed system of a cannon and cannonball, which changes would both result in an increase in the kinetic energy of the cannonball when fired from the cannon?
Answers
Answer:
the length of the cannon
the power of the gunpowder
Answer:
i would say B decrease mass of cannon or decrease mass of cannon ball
Explanation:
because when you fire the cannon the cannon ball and powder exit the cannon then that leaves the cannon ball and i would say that the explosion would force it out the cannon but would not increase its mass.
How is thermal energy transferred during conduction?
Answers
Answer:
Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.
Explanation:
May I have brainliest please? :)
I WILL MARK BRAINLIEST IF CORRECT!!!
Answers
Answer:
I'm fairly sure that the answer is "100 m/s"
Explanation:
Fnet=ma
a=Fnet/m
a=4 N / 0.040 kg
a=100 m/s
please check my work before you submit, i don't wanna let cha down :)
Synchronous satellites are put into an orbit whose radius is 4.2 x 107 m. If the angular separation of the two satellites is 4°, find the arc length that separates them.
1.7 x 108 m
1.5 x 106 m
2.9 x 106 m
1.1 x 107 m
Answers
The arc length that separates them synchronous satellites is (C) 2.9 x 106 m.
Synchronous satellites are those satellites that orbit the Earth at the same speed as the Earth rotates. So, they always stay over the same point on Earth.
Geostationary orbit is the orbit for synchronous satellites whose radius is about 42,164 kilometers above the Earth’s equator. Hence the radius is 4.2 x 107 m.
Let the angle between the two satellites be θ = 4°
We need to calculate the arc length between the two satellites.Arc length = (angle /360) × 2πr
where, r is the radius of the orbit, and angle is in degrees.
Arc length = (4/360) × 2π × 4.2 × 107m= 2.9 × 106m
Hence, the correct option is (C) 2.9 x 106 m.
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when heated the temperature of a water sample increased from 15°C to 39°C. Is absorbed 41840 joules of heat. what is the mass of the sample
Answers
Answer:
Mass of water: 43 g
Explanation
hope it helps
a table tennis ball has a diameter of 3.80 cm and average density of 0.084 0 g/cm3. What force is required to hold ir completely submerged under water?
Answers
The amount of force necessary to keep it submerged in water is F=0.258N.
The force required to hold a table tennis ball submerged in water is calculated using the formula:
\(F =\frac{ (\rho * V * g) }{ A}\)
Where F is the force, ρ is the water's density, V is the ball's volume, g is its gravitational acceleration, and A is its cross-sectional area.
The following formula is used to determine the ball's volume:
\(V = \frac{4}{3}*pi*r^3\)
where r is the ball's radius.
The radius of the ball is half its diameter, thus:
\(r = 3.8 cm^2\)
Therefore,
\(V = \frac{4}{3}*pi *(3.8 cm ^2)3\\V = 0.5222 cm3\)
The cross-sectional area of the ball is calculated using the formula:
\(A = \pi * r^2\\\\A = \pi* (\frac{3.8 cm }{ 2})^2\\A = 4.5257 cm^2\)
Substituting the values in the above formula,
\(F =\frac{ (0.084 g/cm^3 * 0.5222 cm^3 * 9.8 m/s^2) }{4.5257 cm^2}\\F = 0.258 N\)
Hence, the force needed to keep it submerged in water is 0.258N
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anyone know the answer ?
Answers
Answer:
d
Explanation:
the answer of the above mentioned question is 2N to the left.
hope this helps!
four forces act at a point in the image above. calculate the resultant.
Answers
Answer:
50° and 60°
Explanation:
hope this help
The ratio of the potential difference across a conductor to the current in the conductor is called
A) conductivity
B) resistance
C) charge
D) power
Answers
Answer:
The ratio of the potential difference across a metallic conductor to the current in the conductor is known as.
B. Resistance.
Explanation:
According to ohms law " the current passing through a conductor is directly proportional to the potential difference between the ends provided the temperature of the wire remains constant".
What is resistance ?
Resistance is a measure of the opposition to current flow in an electrical circuit
what is a resistor ?
a resistor is a n electric conductor which forms resistance to free flow of electric current, the resistance is measured in Ω
The ratio of the potential difference across the conductor to the current is called resistance
What is Resistance?It is defined as the ratio of the potential difference across the conductor to the current. The resistance is measured in Ω.
\(R = \dfrac VI\)
Where,
\(R\) - resistance
\(V\)- voltage (Potential difference)
\(I\) - current
Therefore, the ratio of the potential difference across the conductor to the current is called resistance.
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Deduce the quark content of a particle with charge +e+e, baryon number 00, and strangeness +1+1
Answers
A particle with charge +e, baryon number 0, and strangeness +1 may content three quarks according to charge conservation along with other fundamental particles.
What is quark?Particle physicists started to understand in the 1960s that quarks, not hadrons, are what make up hadrons, which are not truly elementary particles. (The word "quark" was first used by physicist Murray Gell-Mann in the James Joyce novel Finnegans Wake.) At first, it was thought there were just three sorts of quarks: up (u), down (d), and strange (s). However, this number quickly increased to six, which is interestingly the same as the number of leptons, to include charmed (c), bottom (b), and top (t).
Quarks may have charge of either +2/3e or -1/3e, baryon number 1/3 and strangeness number either 0 or -1.
So, a particle with charge +e, baryon number 0, and strangeness +1 may content three quarks according to charge conservation along with other fundamental particles.
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After pulling the magnets apart completely, does it behave like the unbroken rod-shaped magnet? Why or why not? Does it have north and south poles?
Answers
After pulling the magnets apart completely, they will not behave like the unbroken rod-shaped magnet because they will have been separated into two distinct magnets.
Each magnet will have its own north and south poles, just like the original rod-shaped magnet. So, when you separate the magnets, you will end up with two separate magnets that each have their own distinct magnetic fields. This means that they will interact differently with other magnets and with magnetic materials compared to the unbroken rod-shaped magnet.
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Much of the pollution in out oceans comes from:
a.) car exhaust
b.) organic pesticides
c.) sewage and industrial waste
d.) fumes and smog
Answers
Answer:
c.) sewage and industrial waste
What is the momentum of a 5-kg bowling ball when at rest?
Answers
Answer:
It has 0 momentum
Explanation:
It has 0 momentum Because the ball is at rest and usually momentum is when an object is speeding up so the ball has 0 momentum because it is still and has 0 velocity