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The sound from two loudspeakers is received by a microphone at a point far away along the line …?

The sound from two loudspeakers is received by a microphone at a point far away along the line through the speakers. The microphone registers maximum intensity when the speakers are 20 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 44 cm. If the distance between the speakers continues to increase, at what separation will the sound intensity again be a maximum?

The distance to the micophone is given as ‘far away’ and therefore no allowance need be made for the increase in distance as the speaker is moved.
The separation of the trough and peak intensity is 44 minus 20 cm = 24cm which is the peak to zero distance.
44 + 24 = 68cm separation to the next peak.
68 + 24 = 92cm to the next zero
and so on

This entry was posted on Tuesday, February 23rd, 2010 at 2:20 am and is filed under loudspeakers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

One Response to “The sound from two loudspeakers is received by a microphone at a point far away along the line …?”

  1. The distance to the micophone is given as ‘far away’ and therefore no allowance need be made for the increase in distance as the speaker is moved.
    The separation of the trough and peak intensity is 44 minus 20 cm = 24cm which is the peak to zero distance.
    44 + 24 = 68cm separation to the next peak.
    68 + 24 = 92cm to the next zero
    and so on
    References :

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