Question

for the same pressure and density the speed of sound is highest in a. monoatomic gas b. diatomic gas c. triatomic gas d. polyatomic gas

Answer 1

The answer is monoatomic gas.

EXPLANATION

Kinetic energy directly proportional to temperature.

At a given temperature and pressure, molecules of all gases have same kinetic energy.

This does not imply that they have the same speed.

The gas with light weight that is lower molecular mass move faster.

The gases with higher molecular mass move slowly.

Monoatomic gases have a lower molecular mass compared to diatomic gases, triatomic gases and polyatomic gases.

This makes the speed of sound to be faster in monoatomic gases.