AIEEE 2010 | Atoms and Nuclei Question 218 | Physics

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

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

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

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

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

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 2009

MCQ (Single Correct Answer)

-1

The transition from the state $$n=4$$ to $$n=3$$ in a hydrogen like atom result in ultra violet radiation. Infrared radiation will be obtained in the transition from :

$$3 \to 2$$

$$4 \to 2$$

$$5 \to 4$$

$$2 \to 1$$

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