Fundamentholfundamenthol
JEE Main2019Physics
Q.

If the deBroglie wavelength of an electron is equal to 10–3 times the wavelength of a photon of frequency 6 × 1014 Hz, then the speed of electron is equal to : (Speed of light = 3 × 108 m/s Planck’s constant = 6.63 × 10–34 J.s Mass of electron = 9.1 × 10–31 kg) 

  1. A

    1.7 × 106 m/s

  2. B

    1.45 × 106 m/s

  3. C

    1.8 × 106 m/s

  4. D

    1.1 × 106 m/s

Solution

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