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path difference and speed of wave

(1/1)

astarmathsandphysics:
Sound from a small loudspeaker L reaches a point P by two paths which differ in length by 1.2m. When the frequency of the sound is gradually increased, the resultant intensity at P goes through a series of maxima and minima. A maximum occurs when the frequency is 1000 Hz and the next maximum occurs at 1200 Hz. What is the speed of sound in the medium between L and P?

A   200
B   240
C   480
D   1200
E   1400
Then 1.2 =1/4 of

see attached doc

AN10:
Thank u so much. :)

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