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thoradicus
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Homework Statement
http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_s09_qp_2.pdf
number 5b
The speed of sound is 330ms-1
The frequency of sound from S1 and S2 is increased. Determine the number of minima that will be detected at M as the frequency is increased from 1k to 4k Hz.
Homework Equations
v=fλ
(n+1)λ
The Attempt at a Solution
Okay, first have to find the path difference, which first we have to find the hypotenuse, 128cm.
and then, 128-100=28 cm, that is the path difference
330=(1000)λ
330=(4000)λ
λ is found to be 33 cm and 8.25 cm respectively.
After that, I am not too sure what to do. ..