Tag: time period, frequency and amplitude of sound

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Multiple choice physics sound time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

State whether true or false :

Shrill sound is a high-pitch sound and a soft sound is a low-pitch sound.

  1. True

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

The vocal cords of women are thicker than men , therefore they produce a shrill sound , which we know has higher frequency or higher pitch , whereas men's voice is grave , means low frequency i.e. lower pitch .

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

Fill in the blank.

When sound travels in a medium _______ travels in form of a wave.

  1. the source

  2. the particles of the medium

  3. the disturbance

  4. the medium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When sound travels in a medium the disturbance travels in form of a wave.
Sound is produced when something vibrates. That is, a disturbance is produced. The vibrating body or disturbance causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively.

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

The sound waves in a medium are characterised by the

  1. linear motion of particle in the medium

  2. rotatory motion of particles in the medium

  3. oscillatory motion of particles in the medium

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

Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through air, that is in an oscillatory motion, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. 

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

State whether given statement is True or False
A wave is a disturbance that moves through a medium when the particles of the medium set neighboring particles into motion.

  1. True

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

Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through air, that is in an oscillatory motion, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. The motion of the particles is parallel (and anti-parallel) to the direction of the energy transport. Here, the sound wave does not move the particles of the medium from one place to another but only the vibration or the disturbance moves. 
Hence, the statement is true.

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

Fill in the blank. 

In a wave, the particles of the medium do not move forward themselves, but the _________ is carried forward.

  1. disturbance

  2. frequency

  3. amplitude

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

In a wave, the particles of the medium do not move forward themselves, but the disturbance is carried forward.
Sound is produced when something vibrates. That is, a disturbance is produced.

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

Which of the following is NOT correct?

  1. more oscillation per second, higher time period

  2. greater amplitude greater loudness

  3. higher pitch, higher frequency of vibration

  4. more the value of decibel, higher is the noise
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Time period $T$ is defined as time taken to complete one oscillation , and frequency $f$ of a wave is defined as the number of oscillations per second ,

                     therefore , $T=1/f$  ,
which gives , more oscillations per second i.e. higher frequency , means smaller time period .

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

A person can be identified by the quality of sound produced by him. The characteristic of a sound can be determined by:

  1. amplitude

  2. frequency

  3. loudness

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

The characteristics of a sound are :

(i) Loudness or intensity : it distinguishes between a loud or faint sound , and intensity , depends upon amplitude of sound waves .
(ii) Pitch : it distinguishes a sharp sound from a dull sound and pitch depends upon frequency.
(iii) Quality: it distinguishes between sounds generated by two sources .

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

Which of the following statement is NOT correct?

  1. loudness of sound is determined by the amount of energy received by the ear per unit time

  2. pitch doesn't depend upon the amount of energy

  3. loudness changes with change of frequency

  4. pitch changes with change in frequency
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Among all of the above only loudness changes with frequency is the wrong statement as loudness doesn't change with the change of frequency.

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

Which of the following statements is not true about a sound wave ?

  1. Sound travels faster in steel than in air

  2. Sound is a longitudinal wave

  3. The speed of sound in gas is not affected by a change in pressure of the gas

  4. The speed of sound in a gas decreases with increases in the temperature of the gas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A- Sound travel faster in solid than in gas. Here still is solid and air is gas.
B- Sound is a longitudinal wave as it can travels from one point to another point by to and fro.
C- Speed of sound in gas in independent of pressure and hence the answer.
D- The speed of the sound in a gas increases with the increasing in temperature of the gas. 
Hence D is incorrect ..
Multiple choice physics world of sounds characteristics of sound wave time period, frequency and amplitude of sound sound waves are longitudinal waves

Microphone is used to convert

  1. Electrical energy into sound energy

  2. Sound energy into electrical energy

  3. Sound energy into mechanical energy

  4. Sound energy into chemical energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When we speak on a microphone , our voice (sound energy) is converted in electrical signals (electrical energy) ,which can be transmitted through a wire to a distance .