A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms^–1. The frequency heard by the observer is (speed of sound = 330 ms^–1) ______.

If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in _____

Rapid back and forth motion of a particle about its mean position is called _____

Name three animals, which can hear ultrasonic vibrations.

What will be the frequency sound having 0.20 m as its wavelength, when it travels with a speed of 331 m s^–1?

A sound wave has a frequency of 200 Hz and a speed of 400 m s^–1 in a medium. Find the wavelength of the sound wave.

Why does sound travel faster on a rainy day than on a dry day?

Velocity of sound in the atmosphere of a planet is 500 ms^-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?

Velocity of sound in a gaseous medium is 330 ms^-1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

When a sound wave travels through air, the air particles

Suppose that a sound wave and a light wave have the same frequency, then which one has a longer wavelength?
a) Sound
b) Light
c) both a and b
d) data not sufficient.