First slide

Photo Electric Effect

Question

The photoelectric threshold wavelength for potassium (work function being 2 eV) is

Easy

A

310 nm
B

620 nm
C

1200 nm
D

2100 nm

Solution

$λ = \frac{12375}{W_{o}} = \frac{12375}{2} = 6187 .5 \overset{o}{A} = 620 nm$

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