Waves: Disturbances Which Travels Through a Material Medium

In this quiz, you will find questions based on waves, characteristics of waves, propagation of waves through different mediums, etc.

Start Quiz

What is the expression for wave speed in the given equation: y = Asin(kx-wt + π)?

dy/dt w/k 2πw/k 2πk/w

A string has a mass of 100gm & is under a tension of 10N. What should be its length if the speed of transverse waves is to be 10m/s on the string.

1.8m 10m 1m 2m

Why is the speed of longitudinal waves sound in solids greater than that in liquids?

Solids have lesser bulk modulus Gases have lesser density Solids have greater bulk modulus and density than gases but increase in bulk modulus dominantes over increase in density Gases don’t have lesser particles in a given volume and therefore transfer sound energy slowly

The formula v = √(P/ρ) can be used for any gas considering isothermal process. True or False?

True False

The speed of sound in air is 330m/s. What is the mass of 1 mole of air? Assume it is an ideal gas.

28gm 38gm 20.56gm 29gm

With the increase in temperature, the frequency of the sound from an organ pipe

Decreases Increases Remain unchanged Changes erratically

Loudness of a note of sound is

Directly proportional to amplitude of the wave Directly proportional to square of amplitude of wave Directly proportional to velocity of the wave Directly proportional to square of velocity of the wave

The frequency of the note produced by plucking a given string increases as

The length of the string increases The tension in the string increases The tension in the string decreases The mass per unit length of the string increases

An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be

320 Hz 300 Hz 280 Hz 260 Hz

Energy is not carried by

Longitudinal progressive waves Electromagnetic waves Transverse progressive waves Stationary wave

The ratio of the speed of a body to the speed of sound is called

Mach number Sonic index Doppler ratio Refractive index

For which of the following do the longitudinal waves exist?

Both Air Water None of these

Sound waves transfer

Both energy and momentum

Only energy not momentum

Momentum

Energy