What is cutoff wavelength in modern physics?

[phy]

I'm doing my modern physics assignment and the question asks me to calculate a few different thigns - one of them being the cuttoff wavelength. My question is WHAT IS IT? I looked in my textbook and didn't really see anything about it so any help would be appreciated. Thanks

 

[dextercioby]

It can be either one of these 2 things:either connected with the photoelectric effect,or with X bremsstrahlung.
Tell us in what context does it appear...

Daniel.

 

[phy]

Yah perhaps I should have posted the question too

Light of wavelength 500nm is incident on a metallic surface. If the stopping potential for the photoelectric effect is 0.45 V, find a) the maximum energy of the emitted electrons, b) the work function, c) the cutoff wavelength.

 

[dextercioby]

Okay,then.You should have known this issue from the textbook.It's the maximum wavelength the incident photon may have as to still produce photoelectric effect...

Daniel.