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Answer 1 · 2017-04-03T06:40:55

The frequency is #=136Hz# and the period is #=7.35ms#

The speed of sound is related to the wavelength ang the frequency by

#v=f*lambda#

Speed is #v=340ms^-1#

Wavelength is #lambda=2.5m#

Frequency is #f=v/lambda=340/2.5=136Hz#

The period is

#T=1/f=1/136=0.00735s=7.35ms#