Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 1>Q 68

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The scientific principle that forms the basis of the Tokamak technology is

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Important Questions on Atoms and Nuclei

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 1>Q 69

The equation

4_{1}^{1} H^{+} \to {}_{2}^{4}{He}^{2 +} + 2 e^{- 1} + 26 MeV

represents.

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 1>Q 70

The characteristic

X

-ray radiation is emitted when-

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 1

Ratio of initial active nuclei in two different samples is

2 : 3

. Their half lives are one hour and two hours respectively. Ratio of active nuclei at the end of

6

hours will be

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 2

A radioactive material decays by simultaneous emission of two particles with half-lives

1620

years and

810

years respectively. The time in years after which one - fourth of material remains, is

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 3

In which sequence the radioactive radiations are emitted in the following nuclear reaction?

${}_{Z}X^{A} \to {}_{Z + 1}Y^{A} \to {}_{Z - 1}K^{A - 4} \to {}_{Z - 1}K^{A - 4}$

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 4

A sample contains

16 g

of a radioactive material, the half-life of which is two days. After

32

days, the amount of radioactive material left in the sample is,

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 5

A radioactive element can undergo

α

and

β

type of disintegrations with half-lives $T_{1}$ and

T_{2}

, respectively. Then, the half-life of the element is

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 6

The initial ratio of active nuclei in two different samples is $2 : 3$ . Their half-lives are

2 hours

and $3 hours$ , respectively. The ratio of their activities at the end of $12 hours$ is