1. The problem statement, all variables and given/known data http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/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. 2. Relevant equations v=fλ (n+1)λ 3. 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, Im not too sure what to do. ..