The frequency of a radio station of All India Radio is $1368 \, kHz$. The wavelength of the electromagnetic waves emitted by the transmitter is ............... $m$.

The radiation is emitted when a hydrogen atom goes from a high energy state to a lower energy state. The wavelength of one line in the visible region of the atomic spectrum of hydrogen is $6.5 \times 10^{-7} \, m$. The energy difference between the two states is:

What is the frequency of violet light having wavelength $400 \ nm$?

The radiation with maximum frequency is

Describe the electromagnetic spectrum.

Calculate the frequency and wave number of a photon with a wavelength of $3.6 \ \mathring{A}$.