Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 22

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The atomic weight of boron is $10.81 g {mole}^{- 1}$ and it has two isotopes ${}_{5}^{10}B and {}_{5}^{11}B$ The ratio (by number) of ${}_{5}^{10}B : {}_{5}^{11}B$ in nature would be :

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Important Questions on Nuclear Physics

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 23

Which of the following processes represents a gamma decay?

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 24

An

α

-particle is bombarded on

{}^{14}N

. As a result, a

{}^{17}O

nucleus is formed and a particle is emitted. This particle is a

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 25

A free neutron decays into a proton, an electron, and

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 26

Nuclei

X

decay into nuclei

Y

by emitting

α

-particles. Energies of

α

-particle are found to be only

1 MeV

and

1.4 MeV

. Disregarding the recoil of nuclei

Y

. The energy of

γ

-photon emitted will be

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 27

In one average life,

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 28

A freshly prepared radioactive source of half-life

2 h

emits radiation of intensity which is

64

times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 29

Two isotopes

P

and

Q

of atomic weight

10 g m

and

20 g m

, respectively, are mixed in equal amounts by weight. After

20 days

their weight ratio is found to be

1 : 4

. Isotope

P

has a half-life of

10 days

. The half-life of an isotope

Q

is

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 1>Q 30

10 grams

of

{}^{57}{Co}

kept in an open container beta-decays with a half-life of

270 days

. The weight of the material inside the container after

540 days

will be very nearly