Two speakers, A and B, produce identical sound waves. A listener is 3.2 m away from speaker A. The listener finds the lowest frequency that

Question

Two speakers, A and B, produce identical sound waves. A listener is 3.2 m away from speaker A. The listener finds the lowest frequency that creates destructive interference at his location is 72.4 Hz. How far away is he from speaker B?

in progress 0
Huyền Thanh 4 years 2021-08-12T20:36:12+00:00 1 Answers 69 views 0

Answers ( )

  1. Edana
    0
    2021-08-12T20:37:36+00:00
    Reply

    Answer:

      0.83 m or 5.57 m

    Explanation:

    Destructive interference will occur when the distances from the speakers differ by 1/2 wavelength.

    The length of 1 cycle of 72.4 Hz is …

      λ = v/f = (343 m/s)/(72.4 Hz) ≈ 4.738 m

    So, the distance of the listener from speaker B is …

      3.2 m ± (4.738 m)/2 = {0.83 m, 5.57 m} . . . either of these distances

    _____

    The location could be at additional multiples of 4.738 m, but we think not. The sound intensity drops off with the square of the distance from the speaker, so identical sound waves from the speakers will sound quite different at different distances from the speakers. For best interference, the distances need to be as close to the same as possible. That will be at 3.2 m and 5.57 m.

    _____

    Comment on the speed of sound

    We don’t know what speed you are to use for the speed of sound. We have used 343 m/s. Some sources use 340 m/s, which will give a result different by 2 or 3 cm.

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )