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An electron (mass m) with initial velocity v=v0^i+v0^j is in an electric field E=E0^k. If λ0 is initial de-Broglie wavelength of electron, its de-Broglie wave length at time t is given by

A
λ02 1+e2E20t2m2v20
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B
λ0 1+e2E20t2m2v20
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C
λ0 1+e2E20t22m2v20
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D
λ0 2+e2E20t2m2v20
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