Sound WavesHardBloom L3

Question

If a sound wave is travelling and snap shot at t = 0 is as shown in figure.

Choose snapshot of pressure variation.

(i) (ii) (iii) (iv)

Options

A.For wave travelling towards right or left (i) is correct.
B.For wave travelling towards right graph (iv) and for wave travelling towards left graph (iv) is correct.
C.For wave travelling towards right graph (i) and for wave travelling towards left graph (iii) is correct
D.For wave travelling towards right or left (ii) is correct.

Solution

Sol. ∆ P = $- \frac{B\partial S}{\partial x}$

S = S0 sin(Kx – ωt) or S0 sin (Kx + ωt)

⇒ ∆ P = –S0K cos(Kx – ωt) or –S0 K cos(Kx + ωt)

at t = 0, ∆ P = – S0 K cos Kx (For both directions of travelling)

Create a free account to view solution

View Solution Free
Topic: Sound Waves·Practice all Sound Waves questions

More Sound Waves Questions

A string is cut into three parts, having fundamental frequencies n1, n2 and n3 respectively. Then original fundamental f...A person observes a change of 2.5% in frequency of sound of horn of a car. If the car is approaching forward the person ...Figure, shows a stationary wave between two fixed points P and Q.Which point (s) of 1, 2 and 3 are in phase with the poi...The waves produced by a motorboat sailing in water are : -...The figure (i) shows the graphical representation of the air molecules in a tube of air (length = L) at atmospheric pres...