Question

Does the intensity of a laser affect the amount of current that flows through a photo tube?

Does the intensity of a laser affect the voltage across a photo tube?

I'm working on a lab that has a video where you can adjust the wavelength and see the subsequent change in current or voltage measured, but I'm unable to attach it. I'm just hoping to understand these questions better conceptually.

My thoughts on the first one: Yes, the intensity of the laser does affect the amount of current that flows through the photo tube. The more intense the light, the more electrons are expelled, and thus the higher the current.

Not sure about the second part at all. Help with both?

Answer 1

absolu First one Current [=> solutely correct Intensity => Number 2nd one No. Voltage the în tuun the -> Energy - Frequency Voltage depends upon energy the incident light. This depends upon the frequency of incident light (E = hd) Itigher the energy (or higher the frequency) higher voltage. mr²= K.E. So V x K.E. work function will mean eV = 1 m 1 And K.E. 12 - 4 (fixed) KE & E 5 KE XD ho