AIEEE 2003 | Atoms and Nuclei Question 242 | Physics

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

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

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

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

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

AIEEE 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

A nucleus with $$Z=92$$ emits the following in a sequence: $$$\alpha ,{\beta ^ - },{\beta ^ - },\alpha ,\alpha ,\alpha ,\alpha ,\alpha ,{\beta ^ - },{\beta ^ - },\alpha ,{\beta ^ + },{\beta ^ + },\alpha $$$

Then $$Z$$ of the resulting nucleus is

$$76$$

$$78$$

$$82$$

$$74$$

AIEEE 2003

MCQ (Single Correct Answer)

-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

$$0.4$$ $$ln2$$

$$0.2$$ $$ln2$$

$$0.1$$ $$ln2$$

$$0.8$$ $$ln2$$

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