Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 2>Q 37

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The heavier stable nuclei tend to have a larger $\frac{N}{Z}$ ratio because

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Important Questions on Nuclear Physics

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 2>Q 38

A $U^{238}$ sample of mass $1.0 g$ emits alpha particles at the rate $1.24 \times 10^{4}$ particles per second. $(N_{A} = 6.023 \times 10^{23})$

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 2>Q 39

A nitrogen nucleus

{}_{7}N^{14}

absorbs a neutron and can transform into a lithium nucleus

{}_{3}{Li}^{7}

under suitable conditions, after emitting

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 2>Q 40

The decay constant of a radioactive substance is

0.173 {(years)}^{- 1}

. Therefore,

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 2>Q 41

Let

m_{p}

be the mass of a proton,

m_{n}

the mass of a neutron,

M_{1}

the mass of a

{}_{10}^{20}{Ne}

nucleus and

M_{2}

the mass of a

{}_{20}^{40}{Ca}

nucleus. Then

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 2>Q 42

Nuclei of the radioactive element

A

are being produced at a constant rate

α

. The element has a decay constant

λ

. At the time

t = 0

, there are

N_{0}

nuclei of the element.

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 3>Q 1

An alpha nucleus of energy

\frac{1}{2} m v^{2}

bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to :

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 3>Q 2

Half life of a radioactive substance

' A'

is

4 days .

The probability that a nucleus will decay in two half lives is:

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Alpha Question Bank for Engineering: Physics>Chapter 34 - Nuclear Physics>Exercise - 3>Q 4

In the options given below, let

E

denote the rest mass energy of a nucleus and

n

a neutron. The correct option is