Which of the following travels with the speed of light?

The photoelectric effect is described as the ejection of electrons from the surface of a metal when :

$X$-rays are produced due to

Electromagnetic radiation with maximum wavelength is

$A$ particular radio station broadcasts at a frequency of $1120 \, kHz$. Another radio station broadcasts at a frequency of $98.7 \, MHz$. What will be the wavelength of the radiation for each station?

The charge on gamma rays is