Tag: sound: production of sound

Quizzes (4) Questions (118)

Questions Related to sound: production of sound

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

A sound wave completes $24$ cycles in $0.8\;s$. The time period of the wave would be:

  1. $1/30\;s$

  2. $30\;s$

  3. $1/24\;s$

  4. <span>$24\;s$</span>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A time period is the time taken to complete one cycle.


Given that, the sound wave completes $24$ cycles in $0.8\,s$

So, the time taken to complete one cycle $=\dfrac{0.8}{24}=\dfrac{1}{30}\,s$

Hence the time period is $\dfrac{1}{30}\,s$

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 time period of a vibrating body is $0.01\;sec$. Its frequency will be :

  1. $1.0\;s^{-1}$

  2. $10.0\;s^{-1}$

  3. $100.0\;s^{-1}$

  4. $1000.0\;s^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given,


Time period $=0.01\,sec$

We have to find the frequency

We have the relation,

$Frequency=\frac{1}{Time\,Period}$

That is,

$Frequency=\frac{1}{0.01}=100\,s^{-1}$

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

A man blows a whistle and hears an echo after 1.2 seconds. The distance between the man and the reflector of the sound is _____ m. (take velocity of sound in air as $330 {ms}^{-1}$)

  1. 250

  2. 190

  3. 298

  4. 198
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The total distance traveled by the sound is speed multiplied by time: 330 m/s * 1.2 s = 396 m. Since the sound travels to the reflector and back, the distance to the reflector is half of the total distance: 396 / 2 = 198 m.

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

A source of sound is moving away from an observer at rest with a velocity $50 {ms}^{-1}$. If the frequency of sound is 200 Hz, find the apparent frequency observed by the observer. (Take velocity of sound = $300 {ms}^{-1}$)

  1. 140 Hz

  2. 25.1 Hz

  3. 171.4 Hz

  4. 75.6 Hz
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The apparent frequency is calculated using the Doppler effect formula for a source moving away: f' = f * (v / (v + vs)). Plugging in the values: 200 * (300 / (300 + 50)) = 200 * (300 / 350) = 200 * (6 / 7) = 171.4 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

The frequency of sound waves can be expressed in 

  1. Hz

  2. $cycle/second$

  3. $s^{-1}$

  4. all the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The frequency of a wave is the number of waves passing a point in a certain time. The SI unit of frequency is $Hz$. One Hz is equal to one cycle per second.

We also have the relation between the frequency and the time period as:
$f=\frac{1}{T}$
The time is measured in seconds. So the frequency can also be expressed as $s^{-1}$

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

If the tension in a stretched string is quadrupled, find the change in the fundamental frequency of the transverse wave that can be created in the stretched string.

  1. thrice the original frequency

  2. 1/2 (original frequency)

  3. original frequency

  4. twice the original frequency
Reveal answer Fill a bubble to check yourself
C Correct answer
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 average speed of the to bob of a seconds pendulum is $2 {ms}^{-1}$. Determine the frequency of oscillation.

  1. 0.5 Hz

  2. 1.5 Hz

  3. 0.9 Hz

  4. 2 Hz
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For a pendulum, average speed = total distance / total time. In one oscillation, the bob travels 4A distance in time T. Average speed = 4A / T = 4Af. Given average speed = 2 m/s and length of a seconds pendulum is 1m (T=2s), we find the frequency.

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

Which of the following sounds have the highest frequency?
a) A man shouting.
b) The sound of a whistle.
c) A lion's roar.
d) The sound of a drum.

  1. a

  2. b

  3. c

  4. d
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Low frequency sounds are low pitched like that of a man shouting, a lion's roar, sound of a drum, etc.

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

Fill in the blank.

Shrillness : ______: : Loudness : Amplitude

  1. Pitch

  2. Speed

  3. Frequency

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which are the most important properties of sound?

  1. Amplitude

  2. Frequency

  3. Loudness

  4. <span>Both A and B</span>
Reveal answer Fill a bubble to check yourself
D Correct answer
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.