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Q.

If threshold wavelength  λ0 for ejection of electron from metal is 330 nm, then work function for the photoelectric emission is _____

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a

1.2  ×  10−18 J

b

1.2  ×  10−20 J

c

6  ×  10−19 J

d

6  ×  10−12 J

answer is C.

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Detailed Solution

W=h Cλ0W=6.6  ×  10−34 ×   3  × 108 330  × 10−9=6.6  × 3  × 10-1833=0.6  × 10-18= 6  × 10−19 J
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