Question

If velocity of sound in air is 340m/sec. (i) frequeny when wavelength is 0.65m (ii) wavelength when frequeny is 400 Hz

Answer 1

Frequency=velocity/wavelength
Wavelength=velocity/frequency

Answer 2

Velocity , v = 340 m/s

Wavelength , λ = 0.65 metres

Velocity = Frequency x Wavelength

Frequency = Velocity / Wavelength
= 523.07 Hz [ approx.]

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Velocity , v = 340 m/s

Frequency = 400 Hz

Velocity = Frequency x Wavelength

Wavelength = Velocity / Frequency

= 340 / 400

= 0.85 m