Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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# In the Decay 64cu → 64ni + E+ + V, the Maximum Kinetic Energy Carried by the Positron is Found to Be 0.650 Mev. (A) What is the Energy of the Neutrino Which Was Emitted Together - Physics

ConceptMass-Energy Relation and Mass Defect

#### Question

In the decay 64Cu → 64Ni + e+ + v, the maximum kinetic energy carried by the positron is found to be 0.650 MeV.
(a) What is the energy of the neutrino which was emitted together with a positron of kinetic energy 0.150 MeV?
(b) What is the momentum of this neutrino in kg m s−1?
Use the formula applicable to a photon.

#### Solution

Given:
Maximum kinetic energy of the positron, K = 0.650 MeV

(a) Neutrino and positron are emitted simultaneously.
∴ Energy of neutrino = 0.650 − Kinetic energy of the given positron

= 0.650 − 0.150
= 0.5 MeV = 500 keV

(b) Momentum of the neutrino, P = E/c

Here, E = Energy of neutrino
c = Speed of light

⇒ P = (500 xx 1.6 xx 10^-19)/(3 xx 10^8) xx 10^3

= 2.67 xx 10^-22  "Kgms"^-1

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Solution In the Decay 64cu → 64ni + E+ + V, the Maximum Kinetic Energy Carried by the Positron is Found to Be 0.650 Mev. (A) What is the Energy of the Neutrino Which Was Emitted Together Concept: Mass-Energy Relation and Mass Defect.
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