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Unformatted text preview: 6. Let the ﬁrst minimum be a distance y from the central axis which is perpendicular to the speaker. Then
sin θ = y/(D2 + y 2 )1/2 = mλ/a = λ/a (for m = 1). Therefore,
y =
= D
(a/λ)2 −1 = D
(af /vs )2 − 1
100 m [(0.300 m)(3000 Hz)/(343 m/s)]2 − 1 = 41.2 m . ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
 Fall '08
 SPRUNGER
 Physics

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