In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)
A
$$\frac{1}{{\sqrt {\text{M}} }}$$
B
$$\sqrt {\text{M}} $$
C
$$\frac{1}{{\text{M}}}$$
D
M
Correct Answer: $$\frac{1}{{\sqrt {\text{M}} }}$$