The energy of an electromagnetic radiation is $19.875 \times 10^{-13} \ erg$. What is its wave number in $cm^{-1}$? $(h = 6.625 \times 10^{-27} \ erg \ sec, c = 3 \times 10^{10} \ cm \ sec^{-1})$

Which of the following does not characterise $X$-rays?

The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying a stopping potential of $0.35 \ V$ when radiation of $256.7 \ nm$ is used. Calculate the work function for silver metal.

The Vijayawada $FM$ radio station broadcasts at a frequency of $103.4 \ MHz$. The wavelength of the corresponding radio waves (in $m$) is

Which characteristics of electromagnetic radiation can be explained by its wave nature and particle nature,respectively?

Give the characteristics of electromagnetic radiation. Give the relation between them.