Question

find threshold frequency, when light of wavelength 400nm falls on a metal electrons emerge from the surface of the metal but when wavelength of incident light is decreased to 320 nm electrons move with certain speed.

Answer 1

the required formula will b\[c=f _{0}\lambda _{0}\]

Answer 2

\[f _{0}=\frac{ c }{ \lambda _{0} }\]

Answer 3

another formula u need \[hf=hf _{0}+\frac{ 1 }{ 2 }mv _{m}^{2}\]

Answer 4

u hv to find out the value of \[v _{m}\]