Which rays are not a portion of the electromagnetic spectrum?

The ozone layer blocks radiation of which wavelength?

Which of the following electromagnetic waves have the minimum frequency?

Which of the following is not an electromagnetic wave?

Choose the correct option relating the wavelengths of different parts of the electromagnetic wave spectrum.

$A$ monochromatic source of light operating at $15 \text{ kW}$ emits $2.5 \times 10^{22} \text{ photons/s}$. The region of an electromagnetic spectrum to which the emitted electromagnetic radiation belongs to . . . . . . . (Take $h = 6.6 \times 10^{-34} \text{ J}\cdot\text{s}$ and $c = 3 \times 10^8 \text{ m/s}$).