Atomic Structure Question 385

Question: Calculate the velocity of ejected electron from the metal surface when light of frequency 2×1015Hz fall on the metal surface and the threshold frequency is  7×1014Hz for metal-

Options:

A)  1.37×106

B)  1.26×106

C) 1.45×107

D)  1.37×107

Show Answer

Answer:

Correct Answer: A

Solution:

  • 12mv2=hv−hv0
    ⇒12mv2=h(v−v0)
    ⇒v=2hm(v−v0)

=2×6.6×10−349.1×10−31(2×1015−7×1014)

=1.37×106ms1

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