Subject Experts Solutions for Chapter: Modern Physics, Exercise 1: Practice Exercise

Consider the following statements.
$1.$ Gamma rays are not constituents of nuclei, but they are emitted when a nucleus in an excited state returns to its normal state.
$2.$ The neutron to proton ratio for stable nuclei is always less than one.
$3.$ Beta rays consist of ordinary electrons which are of nuclear origin but do not revolve in orbits.
$4.$ Both $X$-rays and $\gamma$ -rays are electromagnetic radiations.

Of the above statements choose the correct statements.

The penetrating power of $X$-rays can be increased by 

Which one among the following transitions of hydrogen atom emits radiation of the shortest wavelength? 

Which one among the following transitions is associated with the largest change in energy in hydrogen atom? 

Light waves are

The working of a microwave oven involves

Which one of the following statements is not correct? 

$X$-rays are electromagnetic radiation whose wavelengths are of the order of _____.