NEET UG PHYSICS MCQ: NUCLEI

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How much energy must a gamma ray photon have, if it is to materialize into a pair of electron and positron with each particle having a K.E of 1MeV?

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Correct option: B

3.02 MeV

Option B is correct because the gamma ray photon must have enough energy to create the mass of the electron and positron, plus provide their kinetic energies. The rest mass energy of an electron or positron is 0.51 MeV.

More Questions from NUCLEI

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The ratio of the nuclear radii of elements with mass numbers

\mathrm{216}

and

\mathrm{125}

is In a hypothetical fission reaction

{ }_{92} X^{236} \rightarrow{ }_{56} Y^{141}+{ }_{36} Z^{92}+3 R

The identity of emitted particles

({R})

is: The radius of the nucleus of the atom with A=216 is (take

{R_0}\; = \mathrm{ }1.3fm

) The correct sequence of the increasing wavelength of the given radiation sources is Which of the following nuclear fragments corresponding to nuclear fission between neutron

\left({ }_0^1 \mathrm{n}\right)

and uranium isotope

\left({ }_{92}^{235} \mathrm{U}\right)

is correct: Which of the following has the mass closest in value to that of the positron

1\,\,a.m.u = 931\,\,MeV