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Q.

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

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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

answer is A.

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Detailed Solution

By the principle of conservation of linear momentum, magnitude of linear momentum of the particles will be the same. Since λ=hp, option - (1) is right.
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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