Speed of Sound in Gases

IMPORTANT

Speed of Sound in Gases: Overview

This topic covers concepts, such as, Speed of Sound Waves, Newton's Formula for Speed of Sound Waves in Gases, Variation of Speed of Sound With Molecular Mass of Gas & Relative Humidity etc.

Important Questions on Speed of Sound in Gases

EASY
IMPORTANT

The velocity of sound is directly proportional to the square root of the molecular mass of the gas.

EASY
IMPORTANT

Two mono atomic ideal gases are having molecular masses 20 and 30 respectively. They are enclosed at same temperature using separate containers. The ratio of the speed of sound in gas 1 to that in gas 2 is 23.

EASY
IMPORTANT

Consider two mono atomic ideal gases 1 and 2. They are having molecular masses M1 and M2respectively. They are enclosed at same temperature using separate containers. What is the ratio of the speed of sound in gas 1 to that in gas 2?

EASY
IMPORTANT

The velocity of sound is independent of the molecular mass of the gas.

EASY
IMPORTANT

Will the velocity of sound depend upon the molecular mass of the gas? 

MEDIUM
IMPORTANT

A bomb explodes at time t=0 in a uniform, isotropic medium of density ρ and releases energy E, generating a spherical blast wave. The radius R of this blast wave varies with time t as

MEDIUM
IMPORTANT

The speed of the sound in Oxygen O2 at a certain temperature is 460 m s-1. The speed of the sound in Helium He at the same temperature will be (assume both the gasses to be ideal)

EASY
IMPORTANT

The speed of longitudinal waves in a solid bar is given by

EASY
IMPORTANT

What is the correct expression for the speed of the longitudinal waves?

MEDIUM
IMPORTANT

What was the Laplace correction for the speed of longitudinal wave in an ideal gas?

MEDIUM
IMPORTANT

A tuning fork sends out waves of wavelength 68.75 cm and 3 m in air and hydrogen gas respectively. If the velocity of sound in air is 330 m s-1, find the velocity of sound in hydrogen. Also, find the frequency of the tuning fork

EASY
IMPORTANT

A student plotted the following four graphs representing the variation of velocity of sound in a gas (at constant temperature) with the pressure P. Which one is correct?

MEDIUM
IMPORTANT

The pressure wave, P=0.01sin1000t-3xN m2 , corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is 0°C . On some other day when temperature is T , the speed of sound produced by the same blade and at the same frequency is found to be 336 m s1 . Approximate value of T is:

EASY
IMPORTANT

Estimate the speed of sound in air at standard temperature and pressure. The mass of 1 mole of air is 29.0×10-3 kg.

MEDIUM
IMPORTANT

In which season is the quantity of moisture in the air high? 

EASY
IMPORTANT

The velocity of sound in air at a particular temperature is 330 m s-1. What will be its value when temperature is doubled and the pressure is halved?

EASY
IMPORTANT

Velocity of sound in a gaseous medium is 330 ms. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is:

MEDIUM
IMPORTANT

What are the factors that affect the speed of sound in gases?

MEDIUM
IMPORTANT

Select the correct relation out of the following.

EASY
IMPORTANT

If the temperature increases, then what happens to the frequency of the sound produced by the organ pipe?