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Q.

Wavelength 6800 Ao is able to eject photoelectrons of zero velocity from a metal whose threshold frequency is

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a

1.11 × 1015s-1

b

2.22 × 1012s-1

c

3.32 × 1013s-1

d

4.41 × 1014s-1

answer is D.

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Detailed Solution

hv-hv0=KE         hv0=hv        (velocity = 0 ⇒KE = 0)           v0=v = cλ=3×108ms-16800×10-1m                      =30068×1014s-1=4.41×1014s-1
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Wavelength 6800 Ao is able to eject photoelectrons of zero velocity from a metal whose threshold frequency is