AIEEE 2004 | Atoms and Nuclei Question 241 | Physics

An $$\alpha $$-particle of energy $$5$$ $$MeV$$ is scattered through $${180^ \circ }$$ by a fixed uranium nucleus. The distance of closest approach is of the order of

$${10^{ - 12}}\,cm$$

$${10^{ - 10}}\,cm$$

$$1A$$

$${10^{ - 15a}}\,cm$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of the following radiations has the least wavelength ?

$$\gamma $$ - rays

$$\beta $$ - rays

$$\alpha $$ - rays

$$X$$ - rays

AIEEE 2003

MCQ (Single Correct Answer)

-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

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

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

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

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

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

$$76$$

$$78$$

$$82$$

$$74$$

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