Thermodynamics ...

In the indicator diagram, Fig. net amount of work done will be

In Fig. curves between volume V and temperature T are drawn at two different pressure P₁ and P₂. Which of the following statements is true?

A Carnot engine works between 600 K and 300 K. In each cycle of operation, the engine draws 1000 J of heat energy from the source. The efficiency of the engine is

A body cools from 50^oC to 49.9^oC in 5 sec. How long will it take to cool from 40^oC to 39.9^oC? Assume the temperature of surroundings to be 30^oC and Newton’s law of cooling to be valid.

If l is length, A the area of cross section and K, thermal conductivity, then the thermal resistance of the block is given by

The ideal black body is

The phenomenon of black body radiation was explained statisfactorily by

A black body radiates at two temps T₁ and T₂, such that T₁ < T₂. The frequency corresponding to max. intensity is

Air in cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time

A monoatomic gas is suddenly compressed to 1/8 adiabatically. The ratio of its final pressure to initial pressure is (γ = 5/3) th of its initial volume