Question

When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

Fraction of supplied energy which in creases the internal energy is given by

$f=\frac{△U}{(△Q{)}_F}=\frac{(△Q{)}_V}{(△Q{)}_F}=\frac{\mu C_V△T}{\mu C_F△T}=\frac{1}{\gamma }$

For diatomic gas $\gamma =\frac{7}{5}\Rightarrow f=\frac{5}{7}$