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The work funciton of a substance is 4.0 ...

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

A

540 nm

B

400 nm

C

310 nm

D

220 nm

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda_(0) = (hc)/(W) = (6.63 xx 10^(-34) xx 3 xx 10^(8))/(4.0 xx 1.6 xx 10^(-19)) m = 310 xx 10^(-9) m = 310` nm
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