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Amplitude of a wave is represented by

$A = \frac{c}{a + b - c}$

Then resonance will occur when

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Important Questions on Sound Waves

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

In an experiment to determine the gravitational acceleration

g

of a place with the help of a simple pendulum, the measured time period squared is plotted against the string length of the pendulum in the figure. What is the value of

g

at the place?

MEDIUM

Physics>Oscillations and Waves>Sound Waves>Resonance

A stretched wire vibrates with a frequency of

60 Hz

when the tension in the wire is

T_{1}

and with a frequency of

130 Hz

when the tension in the wire is

T_{2}

. If the tension in the wire is

(T_{1} + T_{2}),

its frequency of vibration is

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

The amplitude of a simple pendulum, oscillating in air with a small spherical bob, decreases from 10 cm to 8 cm in 40 seconds. Assuming that Stokes law is valid, and ratio of the coefficient of viscosity of air to that of carbon dioxide is 1.3, the time in which amplitude of this pendulum will reduce from 10 cm to 5 cm in carbondioxide will be close to (ln 5 = 1.601, ln 2 = 0.693).

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

A block of mass

1 kg

attached to a spring is made to oscillate with an initial amplitude of

12 cm

. After

2

minutes the amplitude decreases to

6 cm

. Determine the value of the damping constant for this motion. (take

\ln 2 = 0.693

)

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

Consider a driven damped mechanical oscillator is in resonance. Which of the following statements is true ?

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

The bob of simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob get suddenly unplugged. During observation, till water is coming out, the time period of oscillation would

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

A block of mass

0.1 kg

is connected to an elastic spring of spring constant

640 N m^{- 1}

and oscillates in a damping medium of damping constant

10^{- 2} kg s^{- 1}

. The system dissipates its energy gradually. The time taken for its mechanical energy of vibration to drop to half of its initial value, is closest to-

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

T_{0}

is the time period of a simple pendulum at a place. If the length of the pendulum is reduced to

\frac{1}{16}

times of its initial value, the modified time period is

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

Define resonant vibrations.

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

Two pendulums $C$ and $D$ are suspended from a wire as shown in the given figure. Pendulum $C$ is made to oscillate by displacing it from its mean position. It is seen that $D$ also starts oscillating. Name the type of oscillation, $D$ will execute.

Question Image

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

In a parallel LCR circuit, the current at resonance will be

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

The phenomenon that occurs when the frequency of forced vibrations on an object matches the natural frequency of that object, and produces a dramatic increase in amplitude is called

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

Time period of a simple pendulum is

T

inside a lift when the lift is stationary. If the lift moves upwards with an acceleration

\frac{g}{2}

, the time period of pendulum will be :

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

The displacement of a damped harmonic oscillator is given by

x (t) = e^{- 0.1 t} \cos (10 π t + φ) .

Here

t

is in seconds. The time taken for its amplitude of vibration to drop to half of its initial value is close to:

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

The amplitude of a mass-spring system, which is executing simple harmonic motion decreases with time. If mass

= 500 g

, Decay constant

= 20 g s^{- 1}

then how much time is required for the amplitude of the system to drop to half of its initial value?

(\ln 2 = 0.693)

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

The system that returns to equilibrium as quickly as possible without oscillating is

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

When a simple pendulum is moved from the Earth's surface to deep mine, the period of oscillation

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

In Melde's experiment, when the tension decreases by

0.009 kg - wt

, the number of loops changes from

4

5

. The initial tension is

HARD

Physics>Oscillations and Waves>Sound Waves>Resonance

A simple harmonic oscillator of angular frequency

2 rad s^{- 1}

is acted upon by an external force

F = \sin t N .

If the oscillator is at rest in its equilibrium position at

t = 0,

its position at later times is proportional to:

EASY

Physics>Oscillations and Waves>Sound Waves>Resonance

In case of a forced vibration, the resonance wave becomes very sharp when the:

Amplitude of a wave is represented by A⁡ = c a + b - c Then resonance will occur when

Important Questions on Sound Waves

Learn and Prepare for any exam you want !

Amplitude of a wave is represented by

$A = \frac{c}{a + b - c}$

Then resonance will occur when