First slide

Photo Electric Effect

Question

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

Easy

A

540 nm
B

400 nm
C

310 nm
D

220 nm

Solution

$λ_{o} = \frac{hc}{W_{o}} = \frac{12400}{4} = 3100 \overset{o}{A} = 310 nm$

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