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Question

The energy that should be added to an electron to reduce its de broglie wavelength from 1 nm to 0.5 nm is
  1. Four times the initial energy.
  2. Equal to initial energy.
  3. Twice the initial energy.
  4. Thrice the initial energy.

A
Equal to initial energy.
B
Twice the initial energy.
C
Thrice the initial energy.
D
Four times the initial energy.
Solution
Verified by Toppr

λ=hp=h2m(KE)

New energy should be 4 times and hence energy to be added is thrice the initial energy.
So, the answer is option (D).

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