Question

what is cavity ?????????​

Answer 1

Answer:

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Explanation:

Cavities are permanently damaged areas in the hard surface of your teeth that develop into tiny openings or holes. Cavities, also called tooth decay or caries, are caused by a combination of factors, including bacteria in your mouth, frequent snacking, sipping sugary drinks and not cleaning your teeth well

Answer 2

Answer:

Ans.

(1) A cavity radiator is a block of material with intermal

cavity. The inner and outer surtaces of the block are

connected by a small hole. Most of the radiant

energy entering the block through the hole cannot

escape from the hole. The block, therefore, acts

almost like a blackbody.

(i) When the cavity radiator is heated to high tempera-

ture, radiation coming out from the hole resembles

blackbody radiation. It is called cavity radiation.

It depends only on the temperature of the radiator

and not on the shape and size of the cavity as well

as the material of the walls of the cavity