First slide

Matter waves (DC Broglie waves)

Question

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

Easy

A

Increasing, increasing
B

Increasing, decreasing
C

Decreasing, same
D

Same, same

Solution

$λ = \frac{h}{mv} .$ 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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