ICSE Class 10 Physics 2017 Solved Paper

Question : 13

Total: 65

The human ear can defect continuous sounds in the frequency range from 20‌Hz to 20,000 Hz. Assuming that the speed of sound in air is 330ms−1 for all frequencies, calculate the wavelengths corresponding to the given extreme frequencies of the audible range.

Solution:

Given : Frequency range =20‌Hz to 20,000 Hz, speed of sound in air(v)=330ms−1.
We Know,
v‌=fλ.
∴‌ Case ‌1→330‌=20×λ1
λ1‌=‌

330

=16.5m
‌ Case ‌2→330‌=20,000×λ2
λ2‌=‌

330

20,000

=0.0165m.
∴ Wavelength range is 0.0165m to 1.65m.

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