Tag: time period, frequency and amplitude of sound

Questions Related to time period, frequency and amplitude of sound

The sounds having frequency of $20$ Hz to $20,000$ Hz are

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. Ultrasound

  2. Infrasonics

  3. Hypersonics

  4. Audible Sounds

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Correct Option: D
Explanation:

In the case of sound waves, having frequency in between $20$ Hz and $20,000$ Hz, called audible sound and  waves of frequency smaller than $20$ Hz are called infrasonic and waves having frequency greater then $20,000$ Hz, called Hypersonics sounds.

The time taken by a particle in reaching from a trough to its next crest in a transverse wave 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. T/4

  2. T/2

  3. T

  4. 3T/4

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Correct Option: B
Explanation:

A crest and a trough are separated by a distance of $\lambda/2$. A distance of $\lambda/2$ corresponds to a time difference of T/2

The equation of motion of a particle is $x = a cos(\alpha t)^2$. The 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. periodic but not oscillatory

  2. periodic and oscillatory

  3. oscillatory but not periodic

  4. neither periodic nor oscillatory.

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Correct Option: C
Explanation:

The motion is oscillatory but not periodic because the oscillations are followed from the maximum displacement (negative extreme) at t=0, the corresponding echo is equal to π/2

The motion of a pendulum 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. translatory motion

  2. rotational motion

  3. oscillatotry motion

  4. curvilinear motion

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Correct Option: C
Explanation:

The motion of simple pendulum is an example of oscillatory motion.

The motion described by the needle of sewing machine is oscillatory motion. True or 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:

A needle of sewing machine performs a back and forth motion. This kind is called oscillatory motion.

State whether true or false.
Piston of the engine in a motor car exhibits 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. True

  2. False

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Correct Option: A
Explanation:

A piston of a car engine exhibits an oscillatory motion. It maintains a back and forth motion.

State whether true or false.
All periodic motion need not be oscillatory but all oscillatory motions
are periodic.

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:

Any motion that repeats itself at regular intervals of time is periodic in
nature (e.g., motion of a planet around the sun) but it is not necessarily
oscillatory But all oscillatory motions undergo periodic repetitions hence 
are always periodic

If a body moves back and forth repeatedly about a mean position, it is said to possess 

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. rotatory motion

  2. projectile motion

  3. oscillatory motion

  4. Reciprocating motion

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Correct Option: C
Explanation:

Oscillation is the process of swinging or moving to and fro in a steady, uninterrupted manner, and oscillatory motion is the movement created by the process.

In the equations below, A, B, $\omega$ and $\phi$ are constants; $y$ and $t$ are variables; $t$ represents time. Only one of the following equations does not represent SHM. Which one is that?

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. $y= A sin \omega t$

  2. $y= B cos \omega t$

  3. $y= A sin \omega t + B cos \omega t$

  4. $y= A sin \omega t + B cos (2\omega t)$

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Correct Option: D
Explanation:

A linear combination of coherent simple harmonic motions would result in another simple harmonic motion.

But the combination of two incoherent simple harmonic motions($Asin\omega t,B cos(2\omega t)$) is NOT an SHM.
Hence the answer is option D.

Which of the following is not an 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. The tuning fork

  2. The stretched string

  3. The motion of the swing

  4. None of the above

Show answer
Correct Option: D
Explanation:

Oscillation is a motion in which a body moves back and forth repeatedly about a mean position. Since in all the first 3 options, the motion is oscillatory, the correct option is 'None of these'.