Tag: time period, frequency and amplitude of sound

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Questions Related to time period, frequency and amplitude of sound

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

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

  1. the moisture content of the air.

  2. the temperature of air.

  3. the atmospheric pressure.

  4. the composition of air.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. l and ll

  2. ll only

  3. ll and lll

  4. l, ll, and lll
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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

  1. wave number

  2. wavelength

  3. wave velocity

  4. frequency
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

Ultrasound has frequency of vibration .....

  1. between 20 Hz and 20000 Hz.

  2. below 20 Hz.

  3. above 20000 Hz.

  4. between 500 Hz and 10000 Hz.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice 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 Hz is:

  1. 1 vibration per minute.

  2. 360 vibration per minute.

  3. 10 vibration per minute.

  4. 60 vibration per minute.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

The unit of frequency is:-

  1. Hertz

  2. Joule

  3. Ohm

  4. Kilo Calorie
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

Hertz stands for:

  1. second

  2. second$^{-1}$

  3. meter

  4. meter$^{1}$
Reveal answer Fill a bubble to check yourself
B Correct answer
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,
$second^{-1}=Hertz$ 

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

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

  1. 0.2 hz

  2. 0.02 hz

  3. 0.002hz

  4. 50Hz
Reveal answer Fill a bubble to check yourself
D Correct answer
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 .