Tag: time period, frequency and amplitude of sound

Questions Related to time period, frequency and amplitude of sound

Through which of the following media does sound travel the fastest?

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. Cold water

  2. Warm air

  3. Cold air

  4. Steel

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Correct Option: D
Explanation:

Speed of sound is depends upon the elasticity of the material. In the given option steel have highest elasticity so sound will travel fastest through steel.

The velocity of sound in air is not affected by change in 

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. the moisture content of the air.

  2. the temperature of air.

  3. the atmospheric pressure.

  4. the composition of air.

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Correct Option: C
Explanation:

The speed of sound depends on temperature. The formula relating speed of sound and temperature is as follows:

$v = 331 + 0.6 \times T$, where $T$ is temperature in absolute scale and $v$ is in $m/s$.
Humidity has little effect on the speed of sound.
Air pressure has no effect at all in an ideal gas approximation. This is because pressure and density both contribute to sound velocity equally, and in an ideal gas the two effects cancel out each other, leaving only the effect of temperature.
Composition of air has also almost no effect on the speed of sound.

Consider the following
l. Waves created on the surfaces of a water pond by a vibrating source.
ll. Wave created by an oscillating electric field in air.
lll. Sound waves travelling under water. 
Which of these can be polarized

physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

  1. l and ll

  2. ll only

  3. ll and lll

  4. l, ll, and lll

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Correct Option: A
Explanation:

Sound waves are longitude and can not be polarized. Answer A

When sound wave is refracted from air to water, which of the following will remain unchanged?

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. wave number

  2. wavelength

  3. wave velocity

  4. frequency

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Correct Option: D
Explanation:

Frequency of a wave is characterised by the source of wave, therefore it will not be affected by change in medium . 

Ultrasound has 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. between 20 Hz and 20000 Hz.

  2. below 20 Hz.

  3. above 20000 Hz.

  4. between 500 Hz and 10000 Hz.

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Correct Option: C
Explanation:

The term "Ultrasound" refers to the sound having frequency greater than the human audible frequency. Maximum limit of the human audible sound is $20000$ Hz.

So, ultrasound has  frequency of vibration above $20000$ Hz.

1 Hz 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. 1 vibration per minute.

  2. 360 vibration per minute.

  3. 10 vibration per minute.

  4. 60 vibration per minute.

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Correct Option: D
Explanation:

Frequency of 1 Hz implies to 1 complete vibration per second. This means, 60 complete vibrations in 60 second, or, in 1 minute.

The unit of frequency 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. Hertz

  2. Joule

  3. Ohm

  4. Kilo Calorie

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Correct Option: A
Explanation:

Frequency is the number of complete vibrational cycles of a medium per a given amount of time. The frequency would have units of cycles/second, waves/second or vibrations/second. The unit for frequency is the Hertz (abbreviated Hz) where 1 Hz is equivalent to 1 cycle/second. 

Hertz stands for:

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. second$^{-1}$

  3. meter

  4. meter$^{1}$

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Correct Option: B
Explanation:

Hertz is the unit of frequency and frequency is defined as number of vibrations per second ,

        $f=$number of vibrations/ time (in second) ,
which gives frequency in,
$second^{-1}=Hertz$ 

An object oscillates 50 times in one second. What would be its frequency?

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. 0.2 hz

  2. 0.02 hz

  3. 0.002hz

  4. 50Hz

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Correct Option: D
Explanation:

Frequency is defined as the number of oscillations in one second , as the given object is oscillating , 50 times in one second therefore its frequency is 50 Hz .

Fill in the blank.

The time taken by ___ oscillation  to complete is called time period. 

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. One

  2. Two

  3. Three

  4. Four

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Correct Option: A
Explanation:
Time period can be defined as time to complete one full oscillation. Hence A is the correct answer.