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Frequency

A staircase h...

Question

A staircase has a large number of steps each of width 25 cm and height 20 cm. A sharp sound is made at a distance in front of the staircase. The frequency of the musical note produced by the echelon effect is (take speed of sound in air as 350 m/s)

700 Hz

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350 Hz

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437.5 Hz

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875 Hz

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Solution

The correct option is B 700 Hz
The width of the staircase are $25 c m$ .
So for a round trip the sound will propagate a distance of $50 c m$ .
The frequency of the musical note produced by the echelon effect is $= \frac{350}{0.5} = 700 H z$

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