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The de-Broglie wavelength of an electron moving with a velocity 1.5 x 108 ms-1 is equal to that of a photon. The ratio of the kinetic energy of the electron to that of the photon is ________.

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We use hmv=λ⇒EkEph=12mv2hcλ=m2v2λ2hcm=v2c=14

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