Light is shone on a metal and photoelectrons are emitted.

Question

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

Answer 1

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

Answer 2

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