1.The physical significance of ....... is that it tells us how fast heat is propogated or it diffuses through a material during changes of temperature with time.

Question

2. According to Krichoff's law in thermal equilibrium absorptivity is equal to ........
3.In conduction heat transfers from...... temperature to low temperature.
4.In providing critical radius of insulation ....... & ........ are having significant importance.
5.Radiations are ....... waves.

Answer 1

Devi, Guru and Rafeeq,

Don't bother using different names. It is easier to address questions from the same person under the same name.

Also, many of these questions are standard definitions which you can obtain from Wiki pages after a little reading.

If you had read question 3, you will be pleasantly surprised how much you could do if you tried.

Answer 2

I do not know