If two speakers emit sound at same frequency and phase, maximum loudness occurs when path difference equals:

A. half a wavelength
B. one whole wavelength
C. a quarter of a wavelength
D. three quarters of a wavelength

Explanation

A path difference of a whole number of wavelengths brings the two waves back into phase so their crests coincide, giving constructive interference and maximum loudness. An odd number of half wavelengths puts them in antiphase and produces a quiet point instead. The Greek symbol for wavelength did not print cleanly in the original paper.

If two speakers emit sound at same frequency and phase, maximum loudness occurs when path difference equals:

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