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. | \(2v\) |

Subtopic: Speed of Sound |

78%

From NCERT

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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 \(5~\text{m}\) | 4. | \(100~\text{Hz}\) and \(6~\text{m}\) |

Subtopic: Speed of Sound |

80%

From NCERT

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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 \(10\) |

Subtopic: Speed of Sound |

77%

From NCERT

AIPMT - 2011

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A person standing between two parallel hills fires a gun and hears the first echo after ${\mathrm{t}}_{1}$ sec and the second echo after ${\mathrm{t}}_{2}$ sec. The distance between the two hills is: [Given: Speed of sound = v]

$1.$ $\frac{\mathrm{v}\left({\mathrm{t}}_{1}-{\mathrm{t}}_{2}\right)}{2}$

$2.$ $\frac{\mathrm{v}\left({\mathrm{t}}_{1}{\mathrm{t}}_{2}\right)}{2\left({\mathrm{t}}_{1}+{\mathrm{t}}_{2}\right)}$

$3.$ $\mathrm{v}\left({\mathrm{t}}_{1}+{\mathrm{t}}_{2}\right)$

$4.$ $\frac{\mathrm{v}\left({\mathrm{t}}_{1}+{\mathrm{t}}_{2}\right)}{2}$

Subtopic: Speed of Sound |

55%

From NCERT

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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. \(1 . 73 \times10^{- 3} ~\text{m}\)

Subtopic: Speed of Sound |

55%

From NCERT

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The speed of sound at a constant temperature depends on:

1. | Pressure | 2. | Density of gas |

3. | Above both | 4. | None of the above |

Subtopic: Speed of Sound |

54%

From NCERT

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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. |

Subtopic: Speed of Sound |

54%

From NCERT

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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 |

Subtopic: Speed of Sound |

74%

From NCERT

NEET - 2019

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