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Who discovered ultraviolet rays? Give their frequency range and mention at least two uses.

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Who discovered ultraviolet rays? Give their frequency range and mention at least two uses.
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The ultraviolet rays were discovered by Ritter.
The frequncy range of ultraviolet rays is
`8xx10^(14)Hz` to `3xx10^(17)Hz.` Ultraviolet rays are
used (i) to preserve the food stuff (ii) in burgular
alarm.
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