Question

What are Ultra-Voilet Rays

Answer 1

The harmful rays of the Sun which can cause severe damage to humans are called ultraviolet rays.

Answer 2

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$\textbf{Answer}$:

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Ultra violet rays are discovered by Ritter in 1801. The Ultra-Voilet rays are part of solar spectrum. They can be produced by the arcs of mercury and iron.


$\textbf{\underline{Properties}}$:


1. Ultra violet rays are electromagnetic waves and travel with the speed of light.

2. They can also undergo interference and can be polarised.

3. They also obey the laws of reflection and refraction.

4. They can effect the photographic plate.

5. Ultra violet rays can cause flurorescence in certain metals.

6. Ultra violet rays can not pass through glass but quartz, fluorite and rock salt are transparent to them.


$\textbf{\underline{Applications}}$:


1. Ultra violet rays are used for checking the mineral samples by making use of its property of causing flurorescence.

2. Ultra violet rays absorption spectra is used in the study of molecular structures.

3. Ultra violet rays destroy bacteria and hence it is used for sterilising surgical instruments.



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