Q. No.When you speak to your friend, which of the following parameters have a unique value in the sound produced?
1. Frequency
2. Wavelength
3. Amplitude
4. Wave velocity
An electrically maintained tuning fork vibrates with constant frequency and constant amplitude. If the temperature of the surrounding air increases but pressure remains constant, the sound produced will have
| (a) | larger wavelength |
| (b) | larger frequency |
| (c) | larger velocity |
| (d) | larger time period |
Choose the correct option:
| 1. | (a) and (b) |
| 2. | (a) and (c) |
| 3. | (a), (b) and (c) |
| 4. | (b) and (d) |
The fundamental frequency of a vibrating organ pipe is \(200\) Hz.
| a. | the first overtone is \(400\) Hz. |
| b. | the first overtone may be \(400\) Hz. |
| c. | the first overtone may be \(600\) Hz. |
| d. | \(600\) Hz is an overtone. |
Choose the correct option:
| 1. | (a), (b) and (c) |
| 2. | (b), (c) and (d) |
| 3. | (a) and (b) |
| 4. | all of these |
A tuning fork of frequency 512 Hz is vibrated with a sonometer wire and 6 beats per second are heard. The beat frequency reduces if the tension in the string is slightly increased. The original frequency of the string is
1. 506 Hz
2. 512 Hz
3. 518 Hz
4. 524 Hz
The phenomenon of beats can take place:
| 1. | for longitudinal waves only. |
| 2. | for transverse waves only. |
| 3. | for both longitudinal and transverse waves. |
| 4. | for sound waves only. |
A cylindrical tube, open at both ends, has a fundamental frequency v. The tube is dipped vertically in water so that half of its length is inside the water. The new fundamental frequency is
1. v/4
2. v/2
3. v
4. 2v
An organ pipe, open at both ends, contains
1. longitudinal stationary waves
2. longitudinal travelling waves
3. transverse stationary waves
4. transverse travelling waves
An open organ pipe of length \(L\) vibrates in its fundamental mode. The pressure variation is maximum:
| 1. | at the two ends |
| 2. | at the middle of the pipe |
| 3. | at a distance \(\frac{L}{4}\) inside the ends |
| 4. | at a distance \(\frac{L}{8}\) inside the ends |
When two waves with same frequency and constant phase difference interfere,
| 1. | there is a gain of energy. |
| 2. | there is a loss of energy. |
| 3. | the energy is redistributed and the distribution changes with time. |
| 4. | the energy is redistributed and the distribution remains constant in time. |
Two sound waves move in the same direction in the same medium. The pressure amplitudes of the waves are equal but the wavelength of the first wave is double the second. Let the average power transmitted across cross-section by the first wave be \(P_1\) and that by the second wave be \(P_2.\) Then:
| 1. | \(P_1=P_2~~~~~\) | 2. | \(P_1=4P_2~~~~~\) |
| 3. | \(P_2=2P_1\) | 4. | \(P_2=4P_1\) |
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