H2P-626

Measuring wavelength with a grating

H2 Physics · JC 2 · Medium · Measuring wavelength with a grating

A loudspeaker facing a wall produces sound of frequency 680 Hz. A microphone is moved from the speaker towards the wall and detects adjacent intensity maxima 0.25 m apart. Assuming a stationary wave is formed, calculate the speed of sound in air.

340 m s $^{-1}$
170 m s $^{-1}$
680 m s $^{-1}$
1360 m s $^{-1}$

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