AIEEE 2004 | Atoms and Nuclei Question 286 | 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 2004

MCQ (Single Correct Answer)

-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

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

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

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

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

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

Which of the following atoms has the lowest ionization potential ?

$${}_7^{14}N$$

$${}_{55}^{133}\,Cs$$

$${}_{18}^{40}\,Ar$$

$${}_8^{16}\,O$$