Stopping Potential of Electrons for Different Wave Lengths

[getcarter]

The stopping potential for electrons emitted from a surface illuminated by light of wavelentgh 491 nm is 0.710V. When the incident wavelentgh is changed to a new value, stopping potential is 1.43V.

a) What is this new wavelentgh?

b) What is the work function for the surface?



hf = Kmax


do you have an idea ?
please help.

 

[phyzmatix]

The stopping potential for electrons emitted from a surface illuminated by light of wavelentgh 491 nm is 0.710V. When the incident wavelentgh is changed to a new value, stopping potential is 1.43V.

a) What is this new wavelentgh?

b) What is the work function for the surface?



hf = Kmax


do you have an idea ?
please help.

Hi getcarter. You have to show what you've tried first...(same goes for your Compton shift problem)...