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Q.

In Heinrich Hertz’s experiment on the production of electromagnetic waves by means of spark discharge, it was observed that high voltage sparks across the detector loop were _____ when the emitter plate was illuminated by _____ light

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a

Enhanced, infra-red

b

Degraded, infra-red

c

Enhanced, ultraviolet

d

Degraded, ultraviolet

answer is C.

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Detailed Solution

The ultraviolet light provided sufficient energy for the electrons to escape from the surface of detector (metal) loop and hence the current increased.

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