What is the principle of UV-Visible spectrum ?

What is the principle of UV-Visible spectrum ?
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Answer :

Molecules that have pie electrons or bondless electrons absorb energy from these electronic ultraviolet and visible light rays of the molecular orbitals and are transmitted for short periods of time to high bond resistant molecular orbitals in excited state. This results in UV-Visible or Electronic Absorption Spectrum.
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(3) checking the penetration of ultra-violet rays to the earth Explanation: Ozone in the ozone layer filters out sunlight wavelengths from about 200 nm UV rays to 315 nm, with ozone peak absorption at about 250 nm. This ozone UV absorption is important to life, since it extends the absorption of UV by ordinary oxygen and nitrogen in air (which absorbs all wavelengths < 200 nm) through the lower UV-C (200 nm-280 nm) and the entire UV-B band (280 nm-315 nm).

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