how cathode rays affect photographic plate
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Cathode rays are the invisible rays, emerging normally form the cathode of a discharge tube kept at a presence of (10-2 to 10-3 )mm Hg and under a very high potential difference of the order (10-15) kV, supplied from an induction coil.
Explanation:
Cathode rays can produce x-rays
Cathode rays produce fluorescence
Cathode rays can produce physical and chemical changes
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