AIEEE 2011 | Atoms and Nuclei Question 217 | Physics

The half life of a radioactive substance is $$20$$ minutes. The approximate time interval $$\left( {{t_2} - {t_1}} \right)$$ between the time $${{t_2}}$$ when $${2 \over 3}$$ of it had decayed and time $${{t_1}}$$ when $${1 \over 3}$$ of it had decayed is :

$$14$$ min

$$20$$ min

$$28$$ min

$$7$$ min

AIEEE 2010

MCQ (Single Correct Answer)

-1

A nucleus of mass $$M+$$$$\Delta m$$ is at rest and decays into two daughter nuclei of equal mass $${M \over 2}$$ each. Speed of light is $$c.$$

The binding energy per nucleon for the parent nucleus is $${E_1}$$ and that for the daughter nuclei is $${E_2}.$$ Then

$${E_2} = 2{E_1}$$

$${E_1} > {E_2}$$

$${E_2} > {E_1}$$

$${E_1} = 2{E_2}$$

AIEEE 2010

MCQ (Single Correct Answer)

-1

A nucleus of mass $$M+$$$$\Delta m$$ is at rest and decays into two daughter nuclei of equal mass $${M \over 2}$$ each. Speed of light is $$c.$$

The speed of daughter nuclei is

$$c{{\Delta m} \over {M + \Delta m}}$$

$$c\sqrt {{{2\Delta m} \over M}} $$

$$c\sqrt {{{\Delta m} \over M}} $$

$$c\sqrt {{{\Delta m} \over {M + \Delta m}}} $$

AIEEE 2010

MCQ (Single Correct Answer)

-1

Out of Syllabus

A radioactive nucleus (initial mass number $$A$$ and atomic number $$Z$$ emits $$3\,\alpha $$- particles and $$2$$ positrons. The ratio of number of neutrons to that of protons in the final nucleus will be

$${{A - Z - 8} \over {Z - 4}}$$

$${{A - Z - 4} \over {Z - 8}}$$

$${{A - Z - 12} \over {Z - 4}}$$

$${{A - Z - 4} \over {Z - 2}}$$

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