Question 411: Waves

Question

A sonometer wire of length 25 cm vibrates in unison with a tuning fork. When its length is decreased by 1 cm, 6 beats are heard per second. What is the frequency of the tuning fork?

Accepted Answer

When length decreases, the frequency of wire will increase. If $$\mathrm{n}$$ is the frequency of the tuning fork, then we have fork, then we have
$$\mathrm{n} 	imes 25=(\mathrm{n}+6) 	imes 24$$
$$	herefore \mathrm{n}=144 \mathrm{~Hz}$$

Answer

200 Hz

Answer

72 Hz

Answer

100 Hz

Answer

144 Hz

Waves

A sonometer wire of length 25 cm vibrates in unison with a tuning fork. When its length is decreased by 1 cm, 6 beats are heard per second. What is the frequency of the tuning fork?

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