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JEE Main202117 Mar 2021Morning ShiftPhysicsDual Nature of MatterActual

An electron of mass m and a photon have same energy E . The ratio of wavelength of electron to that of photon is : ( c being the velocity of light)

Options

  1. A1 c 2 m E 1 2
  2. B1 c E 2 m 1 2
  3. C( E 2   m ) 1 2
  4. Dc ( 2 m E ) 1 2

Correct answer

B. 1 c E 2 m 1 2

Step-by-step solution

λ 1 = h 2 m E λ 2 = h c E λ 1 λ 2 = 1 c E 2 m 1 / 2

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