What is the frequency range of $AM$ radio waves?

Write the sources of visible rays and ultraviolet rays and their uses.

Which of the following statements is wrong?

Which of the following radiations are in correct descending order of frequencies?

The ozone layer absorbs

If a source of electromagnetic radiation having power $15 \text{ kW}$ produces $10^{16}$ photons per second,the radiation belongs to which part of the spectrum? (Take Planck constant $h = 6 \times 10^{-34} \text{ Js}$)