Kumar is producing the photoelectric effect by using red light. he wants to increase the energy of emitted electrons. based on the research of albert einstein, what is the best way for him to do this?

increase the intensity of red light.
decrease the intensity of red light.
use a different colored light that has a higher frequency.
use a different colored light that has a lower frequency.

The correct way for him is to use a different colored light that has a higher frequency.

Explanation:

According to Photoelectric relation:

E = energy of the electron

h = Planck constant  

= frequency of light emitted by the electron.

= wavelength of light emitted by an electron.

From the relation we can see that energy of the electron is directly proportional to the the frequency of the light emitted by that electron.

So, in order to have the high energy of the light Kumar should use diferrent colored light with higher frequency.