physics

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Light is shone on a metal and photoelectrons are emitted.
Can you tell me the three things from the listbelow 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

  • physics -

    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 correct help plz

  • physics -

    Increasing the wavelength of the light,
    Changing the metal,
    Decreasing the frequency of the light

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