Question

the canal cavity that connects the cavity of middle ear to the cavity of mouth

Answer 1

we all know that our environment is very necessary for our healthy existence on the earth. A healthy environment depends on the good habits of human beings and the circumstances we create. Human, animal, plants, earth and environment are indirectly connected to each other and necessary for the existence of healthy life here.

However, by any means if our environment gets affected negatively, creates lots of problems and many challenges in living a simple and healthy life. Our environment acts as a natural world for us and provides a protection to us from the natural calamities. However, it becomes helpless in protecting us if we disturbs its natural cycle and force it to harm us.

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