If the de Broglie wavelength of an electron is equal to 10-3 times the wavelength of a photon of frequency 6X1014Hz, then the speed of electron is equal to:
(Speed of light 3X108m/s
Plank's constant = 6.63X10-34 J.s
Mass of electron = 9.1X10-31kg)
Momentum of photon -
- wherein
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