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Physics-

General

Easy

Question

A polished metal plate with a rough black spot on it is heated to about 1400 K and quickly taken to a dark room. The spot will appear

Darker than plate
Brighter than plate
Equally bright
Equally dark

The correct answer is: Brighter than plate

On heating, black spot absorbs maximum radiation. Therefore, when plate is taken to a dark room the spot will emit more radiations than the rest of the plate. Hence, it will appear brighter than the plate.

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