A longitudinal wave of frequency 1000 Hz is travelling in a medium . At a certain point in the medium there is a compression at certain moment . How many milliseconds later would the next rare faction form at this place ? If the velocity of wave is 350 m/s , how for is the earlier compression at this time ?

Question

$(a)\;0.35\;m\qquad(b)\;0.7\;m\qquad(c)\;0.175 \;m\qquad(d)\;0.2 m$