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Q.

If threshold wavelength for ejection of electron from metal is 330nm,then work function for the photoelectric emission in CGS system is

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a

1.2×10-18J

b

6×10-12ergs

c

6×10-19ergs

d

1.2×10-13ergs

answer is B.

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Detailed Solution

W=hνo=hCλ0=6.6×10-27×3×1010330×10-7=6×10-12ergs
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If threshold wavelength for ejection of electron from metal is 330nm,then work function for the photoelectric emission in CGS system is