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Q.

The threshold frequency for potassium (in joule) is 3⋅0×1014per sec. The work function of potassium is

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a

0⋅5×10−19

b

1⋅0×10−19

c

2⋅0×10−19

d

4⋅0×10−19

answer is C.

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Detailed Solution

W0=hv0=6⋅62×10−343×1014 ≃2×10−19 joule
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