Question

# The work function of a substance is 4.0eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

A
5400A0
B
4000A0
C
3100A0
D
2200A0

Solution

## The correct option is C 3100$$A^{0}$$$$\phi =\dfrac{hc}{\lambda_m}$$$$\lambda_m=\dfrac{hc}{\phi }$$$$=\dfrac{1240}{4} (hc=1240 ev-nm)$$$$=310nm$$$$=3100A.$$So, the answer is (C).Physics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More