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Physics -- Sound
6.
The tension of a string is increased by 44%. If its frequency of
vibration is to remain unchanged, its length must be increased by
- A.44 %
- B.√44 %
- C.22%
- D.20%
- Answer
- Report
Answer : [D]
7.
In a sonometer wire, the tension is maintained by suspending a 50.7-kg mass from the free end of the wire. The suspended mass
has a volume of 0.0075 m3. The fundamental frequency of the wire is 260 Hz. If the suspended mass is completely submerged
in water, the fundamental frequency will become
- A.200 Hz
- B.220 Hz
- C.230 Hz
- D.240 Hz
- Answer
- Report
Answer : [D]
8.
A string of length 0.4 m and mass 10-2 kg is clamped at its ends. The tension in the string is 1.6 N. When a pulse travels along the string, the shape of the string is found to be the same at times t and t + ∆t. The value of ∆t is
- A.0.05 s
- B.0.1 s
- C.0.2 s
- D.0.4 s
- Answer
- Report
Answer : [B]
9.
A string A has double the length, double the tension, double the diameter and double the density as another string B. Their
fundamental frequencies of vibration are nA and nB respectively. The ratio nA/nB is equal to
- A.1/4
- B.1/2
- C.2
- D.4
- Answer
- Report
Answer : [A]
10.
The extension in a string obeying Hooke’s law is x. The speed of
transverse waves in the stretched string is v. If the extension in
the string is increased to 1.5x, the speed of transverse waves in it
will be
- A.1.2v
- B.0.61v
- C.1.5v
- D.0.75v
- Answer
- Report
Answer : [A]
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