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.

What is sound level for intensity of 10^–6 W/m²?

1. 50 dB 

2. 60 dB

3. 70 dB 

4. 80 dB

A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude ${\rho }_0$ inside the tube. If the atmospheric pressure is ${\rho }_A$ , then the ratio of maximum and minimum pressure at the closed end of the tube will be :

1. $\frac{({\rho }_A+{\rho }_0)}{({\rho }_A-{\rho }_0)}$

2. $\frac{({\rho }_A+2{\rho }_0)}{({\rho }_A-2{\rho }_0)}$

3. $\frac{{\rho }_A}{{\rho }_A}$

4. $\frac{\left({\rho }_A+\frac{1}{2}{\rho }_0\right)}{\left({\rho }_A-\frac{1}{2}{\rho }_0\right)}$

Two wires, \(A\) and \(B,\) of a musical instrument 'Sitar' produce \(3\) beats per second. If the tension of \(B\) is raised, the number of beats becomes \(1\) beat per second. If the frequency of \(A\) is \(450~\text{Hz}\), then the original frequency of \(B\) will be:
1. \(447~\text{Hz}\)
2. \(453~\text{Hz}\)
3. \(449~\text{Hz}\)
4. \(451~\text{Hz}\)

The fundamental frequency of an open organ pipe is \(200\) Hz. When the half-length of the pipe is immersed in water, the fundamental frequency of the air column in the pipe will be:
1. \(100\) Hz
2. \(200\) Hz
3. \(400\) Hz
4. \(800\) Hz

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

Which one of the following statements is true?

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. $\frac{1}{2}$

4. 1