Question

Identify the constituent radiations of electromagnetic spectrum which
(A) Is absorbed by ozone layer in the atmosphere
(B) Is produced by bombarding a metal target by high speed electrons
(C) Is used in satellite communication
(D) Has wavelength range between 400nm to 700nm

Answer 1

Hint Electromagnetic spectrum is a range of electromagnetic radiations emitting or absorbing from constituent particles. We are given with the surfaces absorbing or emitting radiations. We have to identify the names of those radiations.

Complete step by step answer
1. Ozone layer absorbs ultraviolet radiations (UV rays). These are harmful rays. UV rays are of 3 types: UVA, UVB, UVC. PUVA is used in fluorescent lamps. UVB rays are responsible for sunburns. These rays are mostly absorbed by the ozone layer. On the other hand, absence of UVB can lead to aging at earlier stages, damaging the retina.
2. X-rays are produced by bombarding a metal target by high speed electrons. X-Rays - when a high electron beam is bombarded on a metal target, x-rays are produced. Radiations consist of d-accelerated electrons. It is used to analyse crystal structures.
3. Radio waves are used for satellite communication. Signals are sent to the antenna where it gets captured and information is processed. Information can be transmitted at large distances.
4. Visible spectrum has a wavelength between 400nm-700nm. Spectrum or range of radiations visible to our eye. It is a part of electromagnetic radiation.

Note
If radiations are produced by an ozone layer, then it will be UV rays. If radiations are produced on striking a metal target then x-rays will be produced. If rays are used to communicate via satellite then radio waves will be used. All these have different ranges of frequencies and wavelengths. One of mostly used radiations which lies in the range of 400nm to 700nm wavelength is visible spectrum.