CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Byju's Answer
Standard IX
Physics
Speed of Sound
Three sources...
Question

Three sources of sound S1, S2 and S3 of equal intensity are placed in a straight line with S1S2 = S2S3. At a point P, far away from the sources, the wave coming from S2 is 120° ahead in phase of that from S1. Also, the wave coming from S3 is 120° ahead of that from S2. What would be the resultant intensity of sound at P?

Open in App
Solution

Given:
All the three sources of sound, namely, S1, S2 and S3 emit equal intensity of sound waves.
Therefore, all three sources have equal amplitudes.
∴ A1 = A2 = A3
Now, by vector method, the resultant of the amplitudes is 0.
So, the resultant intensity at P is zero.
(a)

(b)

flag
Suggest Corrections
thumbs-up
0
similar_icon
Similar questions
Q.

Three sources of sound S1,S2 and S3 of equal intensity are placed in a straight line with S1,S2=S2,S3 (figure 16-E5). At a point P, far away from the sources, the wave coming from S2 is 120∘ ahead in phase of that from S1 Also, the wave coming from S3 is 120∘ ahead of that from S2. What would be the resultant intensity of sound at P?

Q. Among two interfering sources, let sound waves from source S1, be ahead of the phase by 90∘ relative to that of S2. At an observation point P, if PS1−PS2=1.5λ, then the phase difference between the waves from S1 and S2 reaching P is
Q. Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength λ=1 m, in phase. S1 and S2 are placed 1.5 m apart (see fig.). A listener, located at L, directly in front of S2 finds that the intensity is a minimum where he is 2 m away S2. The listener moves away from S1, keeping his distance from S2 fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S1. Then d is


Q. Sound from 2 identical sources S1 and S2 reach a point P. When both sounds reach in the same phase, the intensity at P due to each source is I0. The power of S1 is now reduced by 64% and the phase difference between S1 and S2 is varied continuously. The ratio of maximum to minimum intensity at P is
Q. Two identical speakers, emit sound waves of frequency 103 Hz uniformly in all directions.
The audio output of each speaker is 9π10 mW. A point P is at a distance of 3 m from S1 and 5 m from S2. Resultant intensity of sound at P is

View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Speed of sound tackle
PHYSICS
Watch in App
explore_more_icon
Explore more
Speed of Sound
Standard IX Physics
Join BYJU'S Learning Program
book_image
Solve
book_image
Textbooks
book_image
Question Papers
book_image
Install app
CrossIcon