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NEET2019PhysicsDual Nature of MatterActual

An electron is accelerated through a potential difference of 10,000   V . Its de Broglie wavelength is (nearly): m e = 9 × 1 0 - 31   k g

Options

  1. A12.2 × 10 - 13 m
  2. B12.2 × 10 - 12 m
  3. C12.2 × 10 - 14 m
  4. D12.2 n m

Correct answer

B. 12.2 × 10 - 12 m

Step-by-step solution

The energy of electron K = 10 4   e V λ = h m v = h 2 m K = 6 . 63 × 10 - 34 2 × 9 . 1 × 10 - 31 × 10 4 × 1 . 6 × 10 - 19 ≅ 12.2 × 10 - 12   m

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