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A radioactive nucleus initially at rest decays by emitting an electron and neutron at right angles to one another. The momentum of the electron is  kg m/s and that momentum of the neutron is  kg m/s. The direction of the recoiling nucleus with that of the electron motion is

a)

b)

c)

d)



Question ID - 100137 | SaraNextGen Top Answer

A radioactive nucleus initially at rest decays by emitting an electron and neutron at right angles to one another. The momentum of the electron is  kg m/s and that momentum of the neutron is  kg m/s. The direction of the recoiling nucleus with that of the electron motion is

a)

b)

c)

d)

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

 kg/s

According to law of conservation of momentum, the residual nucleus must move in a direction just opposite to that of  as shown in the figure.  Hence, direction of the recoiling nucleus with that of the electron motion

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