Question

For wireless communication of voice signals through the atmosphere, we use electromagnetic waves in the ___________Region of spectrum.
A. Ultraviolet
B. Visible
C. Microwave
D. Radio wave

Answer 1

Hint: The above problem can be resolved by using the concepts of Microwaves as well as the Radio waves. Generally, these waves possess longer wavelengths that do not bend too much on scattering from the layers of atmosphere. Moreover, they are well absorbed by the atmospheric layers.


Complete step-by-step solution:
Given: The wireless communication of voice signal through the atmosphere.
The atmosphere consists of the various layers of air and gas particles. To achieve wireless communication through these layers of atmosphere, the most appropriate electromagnetic waves that can be used in the region of spectrum are the Microwaves as well as the Radio waves. The reason is that when these microwaves possess lower frequency and higher wavelength, which get reflected from the upper layer of the air molecules. Due to the lower frequency these waves do not possess harmful elements for the human organs.
Therefore, the Microwaves as well as the Radio waves are used for the purpose of wireless communication of voice signal through the atmosphere. And option C and D are correct.


Note: To resolve the given problem, one must have the knowledge of the frequencies of different electromagnetic waves along with mathematical relation between the frequencies and their wavelengths. The concept and nature of each and every category of waves must be clear to achieve the optimal reason to give a problem.