An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with…

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is:
(c being velocity of light)
  1. 1cE2m12
  2. E2m12
  3. c2mE12
  4. 1c2mE12

Solution

De-Broglie wavelength is given by
λe=hp=h2m.E for electron
De-Broglie wavelength of photon is given by
λp=hp=hEc=hcE
λeλp=12mE.Ec=1cE2m

Asked in: NEET 2016 (Phase 1)

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