A ball of mass 1g is moving with a velocity of 10³ m/s. The De_Broglie wavelength of the ball is:
Correct answer: C. 6.63 × 10-³⁴ m
- A. 13.26 × 10^-36 m
- B. 3.315 × 10-³⁴ m
- C. 6.63 × 10-³⁴ m
- D. 4.97 × 10^-26 m
Explanation
momentum= 1/1000 Kg×1000m/s λ= Ph = 1 6.6×10−34J/s /1=6.6×10 −34mOPTION (A,B and D) are incorrect.As, it is a numerical so it could have only one answer.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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