Q. No.A wave moving in a gas:
1.
must be longitudinal
2.
may be longitudinal
3.
must be transverse
4.
may be transverse
Two particles A and B have a phase difference of π when a sine wave passes through the region.
| (a) | A oscillates at half the frequency of B. |
| (b) | A and B move in opposite directions. |
| (c) | A and B must be separated by half of the wavelength. |
| (d) | The displacements at A and B have equal magnitudes. |
Choose the correct option:
| 1. | (a), (b) and (c) |
| 2. | (b), (c) and (d) |
| 3. | (a) and (b) |
| 4. | (b) and (c) |
A wave is represented by the equation
y = (0.001 mm) sin (50 s–1)t + (2.0 m–1)x].
(a) The wave velocity =100 m s–1.
(b) The wavelength = 2.0 m.
(c) The frequency = 25/\(\pi\) Hz.
(d) The amplitude = 0.001 mm.
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. all of these
A standing wave is produced on a string clamped at one end and free at the other. The length of the string:
| 1. | must be an integral multiple of \(\frac{\lambda}{4}\) |
| 2. | must be an integral multiple of \(\frac{\lambda}{2}\) |
| 3. | must be an integral multiple of \(\lambda\) |
| 4. | may be an integral multiple of \(\frac{\lambda}{2}\) |
Which of the following statement is correct?
| 1. | The energy of any small part of a string remains constant in a travelling wave. |
| 2. | The energy of any small part of a string remains constant in a standing wave. |
| 3. | The energies of all the small parts of equal length are equal in a travelling wave. |
| 4. | The energies of all the small parts of equal length are equal in a standing wave. |
In a stationary wave,
(a) all the particles of the medium vibrate in phase
(b) all the antinodes vibrate in phase
(c) the alternate antinodes vibrate in phase
(d) all the particles between consecutive nodes vibrate in phase
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. all of these
Consider the following statements about sound passing through a gas.
| A: | The pressure of the gas at a point oscillates in time. |
| B: | The position of a small layer of the gas oscillates in time. |
| 1. | Both A and B are correct. |
| 2. | A is correct but B is wrong. |
| 3. | B is correct but A is wrong. |
| 4. | Both A and B are wrong. |
When we clap our hands, the sound produced is best described by
(Here p denotes the change in pressure from the equilibrium value)
1. p = p0 sin(kx – ωt)
2. p = p0 sin kx cos ωt
3. p = p0 cos kx sin ωt
4. p = \(\sum\)p0n sin(knx – ωnt)
The bulk modulus and the density of water are greater than those of air. With this much of information, we can say that velocity of sound in air
1. is larger than its value in water
2. is smaller than its value in water
3. is equal to its value in water
4. cannot be compared with its value in water
A tuning fork sends sound waves in the air. If the temperature of the air increases, which of the following parameters will change?
1. Displacement amplitude
2. Frequency
3. Wavelength
4. Time period
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