Question

a sound wave travels at a speed of 300 m/s and its wavelength is 1.5 cm.find the frequency

Answer 1

Speed = 300m/s

Wavelength = 1.5cm = 1.5÷100 = 0.015m

Frequency = Speed/Wavelength

$\frac{300}{0.015}$

= 20,000 Hz

= 20 KHz

Answer 2

Answer:

Velocity= f × lamda(wavelength)

300= f × 15/1000 m

f=300×1000/15

f=300×200/3

f=100×200=20000 hz

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