(A) Gases do not conduct heat
(B) The best conductors are non-metals
(C) Conduction currents occur only in liquids
(D) None of the statements is true.
Q. The essence of the Kirchhoff’s law is that:
(A) A good absorber must be a bad radiator
(B) A good absorber must be a good radiator
(C) A good absorber must be a good conductor
(D) All are true
Q. A bad emitter of radiation is a bad absorber:
(A) True
(B) False
(C) Uncertain
(D) None of these
Answers:
1. (D) None of the statements is true
2. (B) A good absorber must be a good radiator
3. (A) True