Light is shone on a metal and photoelectrons are emitted.
Can you tell me the three things from the list below which might cause the photoelectron emission to stop.
Decreasing the intensity of the light
Increasing the frequency of the light
Decreasing the wavelength of the light
Increasing the wavelength of the light
Changing the metal
Decreasing the frequency of the light
Increasing the intensity of the light
past tense of transitive "shine" is "shined"
(the sun shone as the man shined his shoes)
light intensity has no effect on emission, so we want to decrease the energy:
Increasing the wavelength of the light
Decreasing the frequency of the light
or
Changing the metal
A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first touches the ground until the point it leaves the ground again.
Gravitational potential energy is converted into kinetic energy and then into sound energy.
IS THAT ANSWER CORRECT, HELP PLZ
To determine which factors might cause the photoelectron emission to stop, let's go through each option:
1. Decreasing the intensity of the light: Lowering the intensity of light should not cause the photoelectron emission to stop, as long as the light is still above the threshold intensity required to cause the emission.
2. Increasing the frequency of the light: Increasing the frequency of light will actually promote the photoelectron emission. According to the photoelectric effect, higher frequencies correspond to higher energy photons, which can more easily dislodge electrons from the metal surface.
3. Decreasing the wavelength of the light: Decreasing the wavelength of light correlates with increasing its frequency. As stated above, increasing the frequency promotes photoelectron emission, so decreasing the wavelength of light will also facilitate the process.
4. Increasing the wavelength of the light: Increasing the wavelength of light corresponds to decreasing its frequency and energy. This decrease in energy makes it less likely for photoelectrons to be emitted. Therefore, increasing the wavelength of light is likely to halt or reduce the photoelectron emission.
5. Changing the metal: Altering the metal does affect the photoelectron emission. Different metals have different work functions (the minimum energy required to remove an electron). If the new metal has a higher work function or does not form a suitable surface, the photoelectron emission might stop or diminish.
6. Decreasing the frequency of the light: Decreasing the frequency of light correlates with decreasing its energy. Lower energy photons might not provide enough energy to dislodge the photoelectrons, so decreasing the frequency of light can lead to the cessation of photoelectron emission.
7. Increasing the intensity of the light: Increasing the intensity of light, assuming it is above the threshold intensity, will promote the emission of more photoelectrons. Higher intensity means a greater number of photons per unit time, increasing the chances of dislodging electrons.
From the given list, the three factors that might cause photoelectron emission to stop are:
- Increasing the wavelength of the light
- Changing the metal
- Decreasing the frequency of the light