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 \(5~\text{m}\) | 4. | \(100~\text{Hz}\) and \(6~\text{m}\) |
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. | \(2v\) |
Sound waves travel at \(350\) m/s through warm air and at \(3500\) m/s through brass. The wavelength of a \(700\) Hz acoustic wave as it enters brass from warm air:
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 \(10\) |
Statement I: | The speed of sound waves in a medium depends on the elastic modulus and the density of the medium. |
Statement II: | The speed of sound in a gas is independent of its temperature. |
1. | Statement I is incorrect and Statement II is correct. |
2. | Both Statement I and Statement II are correct. |
3. | Both Statement I and Statement II are incorrect. |
4. | Statement I is correct and Statement II is incorrect. |
A sound wave is passed through a chamber. If the r.m.s. speed of molecules in a gas is v1 and the speed of sound is v2 in the gas, then:
1. | v1 = v2 | 2. | v1 > v2 |
3. | v1 < v2 | 4. | v1 ≤ v2 |
1. | increase by \(1\%\) | 2. | decrease by \(1\%\) |
3. | increase by \(0.5\%\) | 4. | decrease by \(0.5\%\) |
A person standing between two parallel hills fires a gun and hears the first echo after sec and the second echo after sec. The distance between the two hills is: [Given: Speed of sound = v]
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. \(1 . 73 \times10^{- 3} ~\text{m}\)
The speed of sound at a constant temperature depends on:
1. | Pressure | 2. | Density of gas |
3. | Above both | 4. | None of the above |
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. |