Physics Fill In The Blanks[1 Marks ]

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is:

1. 3 : 2
2. 2 : 3
3. 9 : 4
4. 4 : 9

_______ waves do not transfer any energy and momentum in the material medium.

Two sound waves having a phase difference of 60° have path difference of _______.

_______ is mode of transfer of energy and momentum in the form of vibrations of particles of medium.

The quantity which does not change when sound enters from one medium to another is ________.

The frequency of vibrating air column in closed organ pipe is n, if its length be doubled and radius halved, its frequency will be nearly _______.

The waves produced by a motor boat sailing in water are ______.

Two sound waves of slightly different frequency moving in the same direction give rise to _______.

Newton's formula for velocity of sound in gases is _______.

Apparent change in frequency of sound waves when source of sound and listener are in relative motion is known as ______.

Source of sound and observer are moving towards each other the observer will hear ______ frequency.

Mechanical waves require a mechanical medium to propagate. Properties of medium required for mechanical wave propagation is ________ and _________.

The loudness and pitch of a sound note depends on _____ and _____.

Mode of wave propagation in which particles of medium vibrate perpendicular to direction of propagation is known as _______.

The apparent frequency in Doppler's effect does not depend upon _______.

Standing waves are formed on a string when interference occurs between two waves having _______.