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NEET 2012 (AIPMT, Mains) · Matter Waves: de Broglie Wavelength

Matter Waves: de Broglie Wavelength question from NEET 2012 (AIPMT, Mains)

Q142NEET 2012 · AIPMT · MAINSMedium

Matter Waves: de Broglie Wavelength

If the momentum of an electron is changed by P, then the de Broglie wavelength associated with changes by 0.5%. The initial momentum of electron will be

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Answer: (a)

  1. λ=hp⇒Δλλ=Δpp\lambda = \dfrac{h}{p} \Rightarrow \dfrac{\Delta\lambda}{\lambda} = \dfrac{\Delta p}{p} (in magnitude).
  2. Pp0=0.5%=1200\dfrac{P}{p_0} = 0.5\% = \dfrac{1}{200}
  3. p0=200Pp_0 = 200P, so the answer is (a).
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