An electron moving with speed v and a photon moving with speed c , have the same D-Broglie wavelength. The ratio of the kinetic energy of the electron to that of a photon is:

Question

An electron moving with speed v and a photon moving with speed c , have the same D-Broglie wavelength. The ratio of the kinetic energy of the electron to that of a photon is:, 3 c v, v 3 c, v 2 c, 2 c v

MARKS App · Accepted Answer

λ e = λ Ph h p e = h p ph 2 m k e = E ph c 2 m k e = E ph 2 c 2 k e E ph = E ph c 2 1 2 m = p ph c 1 2 m = p e c 1 2 m = m v c 1 2 m = v 2 c

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