The region in the electromagnetic spectrum where the Balmer series lines appear is

Find the wavelength of electromagnetic radiation having frequency $1368 \ kHz$. (in $m$)

The wavelength (in $\mathring{A}$) of a photon having energy $3 \ eV$ is approximately.
$1 \ eV = 1.6 \times 10^{-12} \ erg$
$h = 6.626 \times 10^{-27} \ erg \ s$
$c = 3 \times 10^{10} \ cm/s$

Which properties characterize electromagnetic radiation?

The frequency of an electromagnetic radiation is $2 \times 10^6 \ Hz$. What is its wavelength in metres? (Velocity of light $= 3 \times 10^8 \ m \ s^{-1}$)

The greater the energy of a photon,the