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Radhika Batra Grade: 11
        A copper rod of length 1.0 m is clamped at its middle point. Find the frequencies between 20 Hz and 20,000 Hz at which standing longitudinal waves can be set up in the rod. The speed of sound in copper is 3.8 km s-1.
3 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
										Sol. a) Here given l = 5 cm = 5 × 10^–2 m, v = 340 m/s

⇒ n = V/2l = 340/2 * 5 * 10^-2 = 3.4 KHz
⇒then the highest harmonic in the audible range (20 Hz – 20 KHz)
= 20000/3400 = 5.8 = 5 (integral multiple of 3.4 KHz).
3 years ago
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