First slide

Matter waves (DC Broglie waves)

Question

An electron and a positron are released from rest at same separation from each other. Due to mutual electro static force of attraction they start moving towards each other. Just before collision

Moderate

A

Their de Broglie wavelength will be the same.
B

de Broglie wavelength of positron will be greater than that of electron.
C

de Broglie wavelength of positron will be less than that of electron.
D

Kinetic energy of positron will be greater than that of electron

Solution

By the principle of conservation of linear momentum, magnitude of linear momentum of the particles will be the same. Since $λ = \frac{h}{p}$ , option - (1) is right.

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