The ultraviolet radiant bulbs are made of quartz. Not of glass. Why?

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Solution

The ultraviolet radiant bulbs are made of quartz and not of glass because glass absorbs ultra violet rays while the quartz does not.

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Similar questions

Give reason for the following :

(i) Infrared radiations are used for photography in fog.

(ii) Infrared radiations are used for signals during the war.

(iii) The photographic darkrooms are provided with the infrared lamps.

(iv) A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.

(v) A quartz prism is required for obtaining the spectrum of the ultraviolet light.

(vi) Ultraviolet bulbs have a quartz envelope instead of glass.

Why is the filament of the bulbs made of metal and not of wood?

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