Tag: oscillatory and periodic motion

Questions Related to oscillatory and periodic motion

Fill in the blank.

Shrillness : ______: : Loudness : Amplitude

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. Pitch

  2. Speed

  3. Frequency

  4. None of the above

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Correct Option: C
Explanation:

The loudness of sound is determined by the amplitude of sound since amplitude is merely the magnitude of sound. Similarly, the shrillness or pitch of a sound is determined by frequency and it is directly proportional to frequency.

Which are the most important properties of sound?

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. Amplitude

  2. Frequency

  3. Loudness

  4. Both A and B

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Correct Option: D
Explanation:

The two most important properties of sound are amplitude and frequency because amplitude determines the loudness of sound and frequency determines its pitch. The loudness and pitch affect the quality of sound.

How does a sound making object differ from one that is silent?

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. sound making objects vibrate

  2. sound making objects oscillates

  3. sound making objects shows up and down motion

  4. none

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Correct Option: A
Explanation:

Sound making object can vibrate easily.a vibrating body produces sound when a body vibrates, then the particles of the medium around the object are set into vibrations.

Explain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.

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. when a table is striked lightly, vibrations are produced with less amplitude.

  2. when the table is strikes hard, the amplitude is high.

  3. both A and B

  4. none

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Correct Option: C
Explanation:

If we strike a table lightly the vibrations produced have less amplitude than when we strike the table hard. Since loudness depends on amplitude, soft sound is heard when we strike lightly.

Hertz stands for number of oscillations per:

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. Second

  2. Minute

  3. Hour

  4. Milli second

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Correct Option: A
Explanation:

Hz is the SI unit of frequency which is defined as wave cycles per unit time..  Since SI unit of time is second. Hz is number of wave cycles per second.

So the answer is A.

A sound wave has a frequency of $10$kHz and wavelength $3$mm. How much time will it take to travel $3$ metre?

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. $0.1$ sec

  2. $1$ sec

  3. $10$ sec

  4. $0.01$ sec

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Correct Option: A
Explanation:

$V=f\times \lambda$
$=10\times 10^3\times 3\times 10^{-3}=30$
$t=\displaystyle\frac{d}{v}=\frac{3}{30}=0.1$sec.

Frequency of vibration of a particle is 10 Hz. If the amplitude of vibration is doubled, what will be the change in frequency of vibration

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. frequency doubles

  2. frequency becomes halved

  3. frequency remains same

  4. frequency quadruples

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Correct Option: C
Explanation:

Frequency is a characteristic of source and does not change with amplitude of the wave

The correct option is (c)

The time period of a system executing wave motion depends upon

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. elasticity

  2. inertia

  3. Amplitude

  4. restoring force

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Correct Option: A
Explanation:

Time period of oscillations is directly proportional to square root of modulus of elasticity and inversely proportional to density. Thus option (a) is the correct option

The total energy of sound waves E is related to their frequency n as

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. $E \propto n$

  2. $E \propto \dfrac{1}{n}$

  3. $E \propto \dfrac{1}{n^2}$

  4. $E \propto \dfrac{1}{log n}$

Show answer
Correct Option: A
Explanation:

Energy of a wave is related to its frequency using the formula E = hf, f is the frequency of the wave

A particle performs 20 vibrations in 5 secs. The time period of vibration 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. 2.5 s

  2. 0.1 s

  3. 0.25 s

  4. 4 s

Show answer
Correct Option: C
Explanation:

Time taken for 1 vibration = 5/20 = 0.25 s

The correct option is (c)