Q.

An electron is moving through a field. It is moving (i) opposite an electric field (ii) perpendicular to a magnetic field as shown. For each situation the de_Broglie wave length of electron

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a

Increasing, increasing

b

Increasing, decreasing

c

Decreasing, same

d

Same, same

answer is C.

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Detailed Solution

λ=hmv. Since y is increasing in case (i), but it is not changing in case (ii). Hence, in the first case de-Broglie wavelength will  change, but it second case, it remain the same
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