Q. No.The speed of sound in a medium is \(v.\) If the density of the medium is doubled at constant pressure, what will be the new speed of sound?
| 1. | \(\sqrt{2} v \) | 2. | \(v \) |
| 3. | \(\frac{v}{\sqrt{2}} \) | 4. | \(2v\) |
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A transverse wave moves from a medium \(A\) to a medium \(B\). In medium \(A\), the velocity of the transverse wave is \(500~\text{ms}^{-1}\) and the wavelength is \(5~\text{m}\). The frequency and the wavelength of the wave in medium \(B\) when its velocity is \(600~\text{ms}^{-1}\), respectively are:
| 1. | \(120~\text{Hz}\) and \(5~\text{m}\) | 2. | \(100~\text{Hz}\) and \(5~\text{m}\) |
| 3. | \(120~\text{Hz}\) and \(6~\text{m}\) | 4. | \(100~\text{Hz}\) and \(6~\text{m}\) |
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| 1. | increase by a factor of \(20\). |
| 2. | increase by a factor of \(10\). |
| 3. | decrease by a factor of \(20\). |
| 4. | decrease by a factor of \(10\). |
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A sound wave is passed through a chamber.
If the rms speed of molecules in a gas is \(v_1\) and the speed of sound is \(v_2\) in the gas, then:
1. \(v_1= v_2\)
2. \(v_1> v_2\)
3. \(v_1< v_2\)
4. \(v_1\leq v_2\)
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1. \(\frac{v(t_1-t_2)}{2}\)
2. \(\frac{v(t_1t_2)}{2(t_1+t_2)}\)
3. \(v(t_1+t_2)\)
4. \(\frac{v(t_1+t_2)}{2}\)
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A bat emits an ultrasonic sound of frequency \(1000\) kHz in the air. If the sound meets a water surface, what is the wavelength of the reflected sound? (The speed of sound in air is \(340\) m/sec and in water is \(1486\) m/sec)
1. \(3.4 \times 10^{-4}~\text{m}\)
2. \(1 . 49 \times 10^{- 3} ~ \text{m}\)
3. \(2 . 34 \times 10^{- 2} ~\text{m}\)
4. \(1 . 73 \times10^{- 3} ~\text{m}\)
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| 1. | Pressure | 2. | Density of gas |
| 3. | Above both | 4. | None of the above |
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The velocity of sound in air is:
| 1. | faster in dry air than in moist air. |
| 2. | directly proportional to the pressure. |
| 3. | directly proportional to temperature. |
| 4. | independent of the pressure of air. |
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| 1. | due to the decrease in pressure. |
| 2. | due to a decrease in temperature. |
| 3. | as a result of a decrease in both temperature and pressure. |
| 4. | statement is wrong. |
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1. \(\sqrt{\frac{2}{7}}\)
2. \(\sqrt{\frac{1}{7}}\)
3. \(\frac{\sqrt{3}}{5}\)
4. \(\frac{\sqrt{6}}{5}\)
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