Monohar Pandey Solutions for Exercise 3: Exercise 3

The age of earth can be estimated by

The $\alpha$-particle carries two positive charges. Its mass is very nearly equal to that of

Age of fossil may be found out by determining the ratio of two isotopes of Carbon. The isotopes are _____.

Assertion (A): All compounds contain more than one element.
Reason (R): All compounds are heterogeneous mixtures.

In the decay process A$\stackrel{-\alpha }{\to }$B$\stackrel{-\beta }{\to }$C$\stackrel{-\beta }{\to }$D

Assertion (A): X-rays are used for studying the structure of crystals.

Reason (R): The difference between the atoms of crystals is the order of the wavelength of X-rays.

Assertion (A): U²³⁵ nucleus, by absorbing a slow neutron undergoes fission with the evolution of a significant quantity of heat.

Reason (R): During nuclear fission, a part of the original mass of U²³⁵ is lost and gets converted into heat.

Assertion (A): The nuclear fusion reaction releases less energy than the fission reaction.

Reason (R): The nuclear fusion reaction takes place in the sun and other stars.