Tag: time period, frequency and amplitude of sound

Questions Related to time period, frequency and amplitude of sound

Swinging of table fan is an example of which type of motion?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Oscillatory motion

  2. One dimenetional motion

  3. Projectile motion

  4. None of the above

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Correct Option: A
Explanation:

Any motion in which the body moves to and fro repeatedly is known as oscillation. A table fan swings with a specific time period and constantly moves to and fro.  Hence it is oscillatory motion

Which of the following is/are not periodic motion?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. The motion of the bob of the simple pendulum

  2. Motion of a bouncing ball under the action of gravity and friction

  3. Motion of a planet around the sun

  4. Both A and B

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Correct Option: B
Explanation:

A periodic motion is the one which repeats itself at fixed intervals of time.

A bouncing ball doesn't bounce to the same height everytime. Hence we can't say that the motion is repeating.

Displacement-time graph depicting an oscillatory motion is

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. cos curve

  2. sine curve

  3. tangent curve

  4. straight line

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Correct Option: B
Explanation:

The equation for displacement in oscillation is $x=A\sin(\omega t+\alpha)$

Since $x$ is a sine function of time, the graph is sinusoidal in nature.

Uniform circular motion can also be represented by a simple harmonic oscillator.
State whether given statement is True/False?

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. True

  2. False

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Correct Option: A
Explanation:

The above statement is true as we can represent uniform circular motion by simple harmonic oscillator.

The bye-bye gesture, we do using hands is an example of 

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Periodic motion

  2. Oscillatory motion

  3. Linear motion

  4. Circular motion

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Correct Option: B
Explanation:

The motion of the hand is an oscillatory motion, as the motion repeats in a finite interval of time and the to and fro motion happens in a given time period

As the hand moves to one extreme, a restoring force acts in the opposite direction to move it back to the mean and then to the other extreme position. Thus, the bye-bye gesture of the hand is an oscillating motion


The correct option is (b)

"The motion of a particle with a restoring force gives oscillatory motion". Which of the following forces can be a restoring force for the oscillatory motion.

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Frictional force

  2. A constant force F

  3. A time varying force opposite to direction of motion

  4. Force due to a spring

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Correct Option: D
Explanation:

Frictional force is a constant force acting opposite to the direction of motion
A constant force only makes an object to move in one direction
A time varying force makes an object to move in one direction with its speed increasing
Force due to a spring, keeps varying, as the object is moved away from its mean position and thus acts as a restoring force

The correct option is (d)

In periodic motion, the displacement is

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. directly proportional to the restoring force

  2. inversely proportional to the restoring force

  3. independent of restoring force

  4. independent of any force acting on the particle

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Correct Option: A
Explanation:

The displacement of the body from its equilibrium is directly proportional to the restoring force. Therefore, higher the displacement, higher is the restoring force.

The correct option is (a)

A thin spherical shell of mass $M$ and radius $R$ has a small hole. A particle of mass $m$ is released at its mouth. Then

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. the particle will execute SHM inside the shell

  2. the particle will oscillate inside the shell, but the oscillations are not simple harmonic

  3. the particle will not oscillate, but the speed of the particle will go on increasing

  4. none of these

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Correct Option: D
Explanation:

Firstly ,given that it is a  thin shell i.e hollow sphere then it will perform oscillation on SHM.

In case of solid sphere it performs SHM.

On the superposition of the two waves given as $y _1=A _0 \sin (\omega t-kx)$ and $y _2=A _0\cos \left(\omega t-kx+\dfrac{\pi}{6}\right) $the resultant amplitude of oscillations will be 

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. $\sqrt{3}A _0$

  2. $\dfrac{A _0}{2}$

  3. $A _0$

  4. $\dfrac{3}{2}A _0$

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Correct Option: B

A particle oscillating in simple harmonic motion is :

physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

  1. Never in equilibrium because it is in motion

  2. Never in equilibrium because there is always a force

  3. In equilibrium at the ends of its path because of zero velocity there

  4. In equilibrium at the centre of its path because the acceleration is zero there

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Correct Option: A