AIEEE 2004 | Atoms and Nuclei Question 241 | Physics | JEE Main - ExamSIDE.com

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1

AIEEE 2004

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A nucleus disintegrated into two nuclear parts which have their velocities in the ratio of $$2:1.$$ The ratio of their nuclear sizes will be

A

$${3^{{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}}}:1$$

B

$$1:{2^{1/3}}$$

C

$${2^{1/3}}:1$$

D

$$1:{3^{{\raise0.5ex\hbox{$\scriptstyle 1$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 2$}}}}$$

2

AIEEE 2003

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Which of the following radiations has the least wavelength ?

A

$$\gamma $$ - rays

B

$$\beta $$ - rays

C

$$\alpha $$ - rays

D

$$X$$ - rays

3

AIEEE 2003

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

When a $${U^{238}}$$ nucleus originally at rest, decays by emitting an alpha particle having a speed $$'u',$$ the recoil speed of the residual nucleus is

A

$${{4\mu } \over {238}}$$

B

$$ - {{4\mu } \over {234}}$$

C

$$ {{4\mu } \over {234}}$$

D

$$ - {{4\mu } \over {238}}$$

4

AIEEE 2003

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A radioactive sample at any instant has its disintegration rate $$5000$$ disintegrations per minute. After $$5$$ minutes, the rate is $$1250$$ disintegrations per minute. Then, the decay constant (per minute) is

A

$$0.4$$ $$ln2$$

B

$$0.2$$ $$ln2$$

C

$$0.1$$ $$ln2$$

D

$$0.8$$ $$ln2$$

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