A sine wave sweep is played through a speaker in a large room. An SPL meter shows a significant rise in the level of the sine wave at 43Hz, 86Hz and 129Hz. Assuming that this is caused by standing waves between one set of parallel walls, calculate the distance between the walls.
From the information given above state the next frequency that is likely to cause a rise in level of the meter. What will the wavelength of this frequency be?
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