Question

In the decay

{ }^{64} {Cu} \rightarrow{ }^{64} {Ni}+e^{+}+{v}

, the maximum kinetic energy carried by the positron is found to be

0.650 \mathrm{~MeV}

.

(a) What is the energy of the neutrino which was emitted together with a positron of kinetic energy

0.150 \mathrm{~MeV}?

(b) What is the momentum of this neutrino in

\mathrm{kg} \mathrm{~m} \mathrm{~s}^{-1}?

Use the formula applicable to a photon.

Accepted Answer

(a) $500 \mathrm{~keV};$ (b) $2.67 	imes 10^{-22} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}$

Answer

(a) $500 \mathrm{~keV};$ (b) $6.72 	imes 10^{-22} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}$

Answer

(a) $200 \mathrm{~keV};$ (b) $2.67 	imes 10^{-22} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}$

Answer

(a) $250 \mathrm{~keV};$ (b) $7.62 	imes 10^{-22} \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}$

JEE PHYSICS MCQ: NUCLEI

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