. "All back surfaces are not good radiators." Comment.

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?

Sea is the greatest source of some halogens. Comment.

State Wien's law on radiation.

Alkali metals are good reducing agents why?

What is radiation pressure.

What is Good conductor.

Name any two good sources of vitamin A.

Can order of a reaction be fractional? Comment.

State stefan's law of radiation?