Question

The velocity of sound waves in diatomic gas at 30° C ____________.

Options

• is greater, the greater the molecular weight of the gas

• is greater, the smaller the molecular weight of the gas

• is independent of the molecular weight of the gas

• is less than the speed of sound in a triatomic gas of same molecular weight

Answer 1

The velocity of sound waves in diatomic gas at 30° C is greater, the smaller the molecular weight of the gas.

Explanation:

`"Velocity of sound wave v" prop sqrt(1/"M")  "where, M is weight of gas."`

As a result, the lower the molecular weight of a gas, the higher the sound velocity in that gas.