An electron of mass \( m \) and a photon have same energy \( E \). The ratio of wavelength of el...

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An electron of mass \( m \) and a photon have same energy \( E \). The ratio of wavelength of electron to
\( \mathrm{P} \)
that of photon is ( \( c \) being the velocity of light)
W
(1) \( \frac{1}{c}\left(\frac{2 m}{E}\right)^{1 / 2} \)
(2) \( \frac{1}{c}\left(\frac{E}{2 m}\right)^{\frac{1}{2}} \)
(3) \( \left(\frac{E}{2 m}\right)^{1 / 2} \)
(4) \( c(2 m E)^{1 / 2} \)
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