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COMEDK2015PhysicsDual Nature of Matter

The momentum of electrons having a wavelength 2 Å (given, h=6.626 10⁻³⁴ ~J -s, .m=9.1 10⁻³⁵ ~kg ) is

Options

  1. A6.313 10⁻²⁴ ~kg ^ - m s ⁻¹
  2. B3.313 10⁻²⁴ ~kg - m s ⁻¹
  3. C9.313 10⁻²⁵ ~kg - m s ⁻¹
  4. D12.313 10⁻²⁴ ~kg - m s ⁻¹

Correct answer

B. 3.313 10⁻²⁴ ~kg - m s ⁻¹

Step-by-step solution

Given, h=6.626 10⁻³⁴ ~J - s m=9.1 10⁻³⁵ ~kg Wavelength, =2 Å=2 10⁻¹⁰ ~m Momentum of electron is given as aligned p &= h &= 6.626 10⁻³⁴ 2 10⁻¹⁰ =3.313 10⁻²⁴ ~kg - ms ⁻¹ aligned

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