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An oscillator of frequency 680 Hz drives...

An oscillator of frequency `680 Hz` drives two speakers . The speakers are fixed on a vertical pole at a distance `3 m` from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is `v = 340 m//s` , answer the following questions.

As the person walks toward the pole , the total number of times that the person hears a minimum in sound intensity will be

A

2

B

8

C

4

D

6

Text Solution

Verified by Experts

The correct Answer is:
D
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An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. As the person walks towards the pole , his distance from the pole when he first hears a minimum in sound intensity is nearly

An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. How far is the person from the pole when he hears a minimum in sound intensity a second time ?

An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. At some instant , when the person is at a distance 4 m from the pole , the wave function ( at the person's location) that describes the waves coming from the lower speaker y = A cos (kx - omega t) , where A is the amplitude , omega = 2 pi v with v = 680 Hz (given) and k = 2 pi//lambda Wave function ( at the person's location) that describes waves coming from the upper speaker can be expressed as :

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