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A positron of $1 MeV$ collides with an electron of $1 MeV$ and gets annihilated and the reaction produces two gamma-ray photons. If the effective mass of each photon is $0.0016 amu$ , then the energy of each $γ$ -ray photon is about

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Important Questions on Nuclear Physics

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 25

If mass of the fissionable material is less than the critical mass, then,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 26

The value of binding energy for

{}_{1}H^{2}, {}_{2}{He}^{4}, {}_{26}{Fe}^{56},_{92} U^{235}

are

2.22, 28.3, 492

and

1786

units, respectively. Then, the most stable nucleus is,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 27

The binding energies per nucleon of deuteron and

α

-particle are

x_{1}

and

x_{2}

, respectively. Then, the energy released in the following reaction will be,

_{1} H^{2} +_{1} H^{2} = {}_{2}{He}^{4} + Q

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 28

If the mass of proton

= 1.008

amu

and mass of neutron

= 1.009 amu

then binding energy per nucleon for

{}_{4}{Be}^{9}

(mass

= 9.012 amu

) would be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#1>Q 29

An electron-positron pair (rest mass of each particle $= 0.51 MeV$ ) is produced by a $γ$ -ray photon of energy $2.42 MeV$ . The K.E. imparted to each of the charged particles shall be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#2>Q 1

In the following reaction, a proton bombards a lithium nucleus at rest producing two

α

-particles:

{}_{3}{Li}^{7} + {}_{1}H^{1} \to 2 {}_{2}{He}^{4}

.
The total rest mass of the products is less than the total rest mass of the reactants by

0.01864

atomic mass unit (amu). By mass-energy conversion formula,

1 amu = 931 MeV

approximately. This means that,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#2>Q 2

The radius of the first

(n = 1)

orbit in Bohr's model of hydrogen atom is

0.53 \times 10^{- 10} m

(Planck's constant,

h = 6.63 \times 10^{- 34} J s

, mass of electron

= 9.11 \times 10^{- 31} kg

). The speed of the electron in this orbit is approximately,

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IMPORTANT

Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 12 - Nuclear Physics>Exercise#2>Q 3

A nucleus has a half-life of

30

minutes. At

3 PM

, its decay rate was measured as

120, 000 counts \sec^{- 1}

. What will be the decay rate at

5 PM

A positron of 1 MeV collides with an electron of 1 MeV and gets annihilated and the reaction produces two gamma-ray photons. If the effective mass of each photon is 0.0016 amu, then the energy of each γ -ray photon is about

Important Questions on Nuclear Physics

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A positron of $1 MeV$ collides with an electron of $1 MeV$ and gets annihilated and the reaction produces two gamma-ray photons. If the effective mass of each photon is $0.0016 amu$ , then the energy of each $γ$ -ray photon is about