i) Explain electromagnetic spectrum with neat diagram. ii) Explain atmospheric noise with example.

i) Explain electromagnetic spectrum with neat diagram. ii) Explain atmospheric noise with example. 
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Answer :

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Explanation:- 

The electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths 

The electromagnetic spectrum covers electromagnetic waves with frequencies ranging from below one hertz to above 1025 hertz 

This frequency range is divided into separate bands, and the electromagnetic waves within each frequency band are called by different names; beginning at the low frequency (long wavelength) end of the spectrum these are: radio waves, microwaves, terahertz waves, infrared, visible light, ultraviolet, Xrays, and gamma rays at the high-frequency (short wavelength) end.


Ii ) Atmospheric Noise 

Atmospheric noise or static is caused by lighting discharges in thunderstorms and other natural electrical disturbances occurring in the atmosphere. These electrical impulses are random in nature. Hence the energy is spread over the complete frequency spectrum used for radio communication. 

Example: Lightning 

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