Question

A sound wave in a certain fluid medium
is reflected at an obstacle to form a
standing wave. The distance between
two successive nodes is 3.75 cm. If the
velocity of sound is 1500 m/s, find the
frequency.
[Ans: 20 kHz]
​

Answer 1

Answer:

20×10³ Hz

Explanation:

The distance between nodes referred to in the problem means that that 

λ/2=3.8 cm, or

 λ=0.076 m. Therefore, the frequency is

f=v/λ=(1500 m/s)/(0.076 m)≈20×103 Hz

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