Physics Thermodynamics

An ideal engine whose efficiency is 40%, receives heat at 500 K. If required efficiency is 50%, then intake temperature for the same exhaust temperature is

Choose the correct statement.

In a thermodynamic process, pressure of fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If initial internal energy of the gas was 40 J, what will be final internal energy?

Two waves of wavelength 50 cm and 51 cm produced 12 beats per second. The velocity of sound is

A gas undergoes a cyclic process ABCA as shown. Find the work done by the gas for

8 moles of oxygen and 4 moles of nitrogen are at same temperature T and are mixed. The total internal energy is

Find the speed of sound in oxygen gas at STP.

2 moles of monoatomic gas and 6 moles of diatomic gas are mixed. Molar specific heat, for constant volume, of mixture shall be (R is universal gas constant)

The P-V diagram of 4 g of helium gas for a certain process A → B is shown in the figure.  What is the heat given to the gas during the process A → B?

A Carnot engine working between the temperature 500 K and 1000 K does a work of 1000 J. The heat energy supplied by the source to the engine per cycle is