Question

Shining a beam of light on a metal has no effect. What change would be most likely to cause the ejection of electrons from the metal. Choose all that apply. Group of answer choices Increase the intensity of the light. Decrease the wavelength of the light. Increase the energy of the light.

Answer 1

Decreasing the wave length

Step-by-step explanation:

There is a thresh hold energy/ frequency that has to be attained before emission of electron occurs.

Using planks energy equation

E= hf where E is thresh hold energy and f is thresh hold frequency

Given that f = c/lander

So E = h(c/lander)

Where c is speed of light in vacuum lander =wave length

So therefore since speed of light is constant to reach thresh hold frequency/ energy , reduction of wavelength is required