An ideal gas at `NTP` is enclosed in an adiabatic vertical cylinder havin an area of cross section `A=27 cm^(2)` between two light movable pistons as shown in figure. Spring with force constant `K=37-- N//m` is in a relaxed state initially. Now the lower position is moved upwards a distance `h//2`, `h` being the initial length of gas column . It is observed that the upper piston moves up by a distance `h//16`. Final temperature of gas` 4//3 xx 273 K`. Take `gamma` for the gas to be `3//2`.

Which of the following statements is correct ?

Options

A. Heat given in compression is used to do work against elastic force only.
B. Heat given in compression is used to do work against elastic force and atmospheric force.
C. No work is done during compression.
D. There is no change in internal energy.

Answer

B

Explanation

Heat given an adiabatic compressiont is used to work against elastic force and against atmospheric force.