What is sound level for intensity of 10–6 W/m2?
1. 50 dB
2. 60 dB
3. 70 dB
4. 80 dB
The rate of energy transfer in a wave depends:
1. | directly on the square of the wave amplitude and square of the wave frequency |
2. | directly on the square of the wave amplitude and square root of the wave frequency |
3. | directly on the wave frequency and square of the wave amplitude |
4. | directly on the wave amplitude and square of the wave frequency |
A tuning fork with a frequency of \(800\) Hz produces resonance in a resonance column tube with the upper end open and the lower end closed by the water surface. Successive resonances are observed at lengths of \(9.75\) cm, \(31.25\) cm, and \(52.75\) cm. The speed of the sound in the air is:
1. | \(500\) m/s | 2. | \(156\) m/s |
3. | \(344\) m/s | 4. | \(172\) m/s |
A : The propagation of sound in air should be an isothermal process.
R : As air is bad conductor of heat, its temperature does not change by compression or expansion.
Statement–1 : In the case of a stationary wave,
a person hear a loud sound at the pressure nodes
as compared to the antinodes.
and
Statement–2 : In a stationary wave all the
particles of the medium vibrate in phase.
1. Statement-1 is True, Statement-2 is True,
Statement-2 is a correct explanation for
statement-1
2. Statement-1 is True, Statement-2 is True,
Statement-2 is NOT a correct explanation
for Statement-1
3. Statement-1 is True, Statement-2 is False
4. Statement-1 is False, Statement-2 is True
A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude inside the tube. If the atmospheric pressure is , then the ratio of maximum and minimum pressure at the closed end of the tube will be :
1.
2.
3.
4.
Which one of the following statements is true?
1. | Both light and sound waves in the air are transverse. |
2. | The sound waves in the air are longitudinal while the light waves are transverse. |
3. | Both light and sound waves in the air are longitudinal. |
4. | Both light and sound waves can travel in a vacuum. |
The time of reverberation of a room \(A\) is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double those of room A?
1. 2
2. 4
3.
4. 1
A transverse wave propagating along the x-axis is represented by:
\(y=(x,t)=8.0\mathrm{sin}(0.5\pi x-4\pi t-\frac{\pi}{4})\) where \(x\) is in meters and \(t\) in seconds. The speed of wave is:
1. \(4\pi\) m/s
2. \(0.5\) m/s
3. \(\frac{\pi}{4}\) m/s
4. \(8\) m/s
Two sound waves with wavelengths 5.0 m and 5.5 m, respectively, propagate in gas with a velocity of 330 m/s. How many beats per second can we expect?
1. 12
2. 0
3. 1
4. 6