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Few metals when irradiated with ultravio...

Few metals when irradiated with ultraviolet light emits

A

positively charged particles

B

gamma rays

C

negatively charged particles

D

neutral particles.

Text Solution

Verified by Experts

The correct Answer is:
C
Around in 1887, it was found that certain metals, when irradiated by ultraviolet light, emitted negatively charged particles having small speeds. Also, certain metals when heated to a high temperature were found to emit negatively heated to a high temperature were found to emit negatively charged particles. the value of e/m of these particles was found to be the same as that for cathode ray particles.
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