Q. 9

# A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s^{-1}. (a) By how much is the phase changed at a given point in 2.5 ms? (b) What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?

Answer :

Given:

Speed of sound in air

Frequency of sound wave

(a) As we know,

⇒

Distance travelled by the particle:

Phase difference is given by:

On substituting the values, we get:

(b) For the second case:

Distance between the two points:

On substituting the respective values in the above equation, we get:

The phase difference between the two points is.

Rate this question :

A steel wire has a length of 12 m and a mass of 2.10 kg. What will be the speed of a transverse wave on this wire when a tension of 2.06 × 10^{4} N is applied?

Speed of sound waves in a fluid depends upon

Physics - ExemplarA sound wave is passing through air column in the form of compression and rarefaction. In consecutive compressions and rarefactions,

Physics - ExemplarA steel wire of mass 40 g and length 80 cm is fixed at the two ends. The tension in the wire is 50 N. Find the frequency and wavelength of the fourth harmonic of the fundamental.

HC Verma - Concepts of Physics Part 1