Tag: physics

Questions Related to physics

State whether given statement is True or False
Wave form is equivalent to quality 

physics world of sounds time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Quality is used to describe the quality of the waveform as it appears to the listener. Therefore,  the quality of a note depends upon the waveform. 
Two notes of the same pitch and loudness, played from different instruments do not sound the same because the waveforms are different and therefore differ in quality or tone.
Hence, quality of the sound is affected due to the change in its waveform.

Shock waves are produced by objects

physics world of sounds time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. carrying electric charges and vibrating

  2. vibrating with frequency greater than 20000Hz

  3. vibrating with very large amplitude

  4. moving with a speed greater than that of sound in the medium

Show answer
Correct Option: D
Explanation:

Shocks are caused by objects moving faster than the speed of sound in the medium.
(The shock tries to bring the velocity of the fluid in the medium to subsonic).

Sound waves are not transmitted to long distance because,

physics world of sounds time period, frequency and amplitude of sound amplitude, time period and frequency of a vibration nature and characteristics of sound waves

  1. they are absorbed by the atmosphere

  2. they have constant frequency

  3. the height of antenna required, should be very high

  4. velocity of sound waves is very less

Show answer
Correct Option: A
Explanation:

Sound waves are not transmitted to long distance because they are absorbed by the atmosphere. 

A sound is produced by plucking a string in a musical instrument, then

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

  1. the velocity of wave in the string in equal to the velocity of sound in the string.

  2. the frequency of the wave in the string in equal to the frequency of the sound produced.

  3. the wave in the string is progressive.

  4. the tension in string varies from point to point.

Show answer
Correct Option: B
Explanation:

Frequency of the wave is the property which depends on source.

If A is the amplitude of vibration, then the time taken by a wave to cover a distance of 4A is known as

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

  1. Time period

  2. Half the time period

  3. 1 s

  4. 0.1 s

Show answer
Correct Option: A
Explanation:

Time required to complete one vibration is T secs

In one full vibration, the particle covers a total distance of 4A

Thus, time required to cover a total distance of 4A during one vibration is T secs or 1 Time period

The correct option is (a)

A sound wave travels with a speed of 330 m s$^{-1}$ in air. If the wavelength of the wave is 110 cm, then frequency of the wave is _______.

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

  1. 100 Hz

  2. 200 Hz

  3. 300 Hz

  4. 400 Hz

Show answer
Correct Option: C

Hertz is the unit of

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

  1. Wavelength

  2. Amplitude

  3. Frequency

  4. None of these

Show answer
Correct Option: C
Explanation:

The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI). It is defined as one cycles per second.

If you go on increasing the stretching force on a wire a guitar, its frequency :

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

  1. Increases

  2. Decreases

  3. Remains unchanged

  4. None of the above

Show answer
Correct Option: A
Explanation:

On increasing the stretching force on a wire in a guitar, the frequency also increases.

Loudness or intensity of sound depends upon:

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

  1. amplitude of soundwave

  2. area of vibrating body

  3. distance from the source of sound

  4. all of above

Show answer
Correct Option: A
Explanation:

The intensity or loudness of sound depends upon  ,

(1) Amplitude (A) of vibration of the source ,
         $I\propto A^{2}$ ,
(2) Surface area  (a) of vibrating body ,
          $I\propto a$ ,
(3) Distance (r) of listener from the source ,
            $I\propto r$ ,  
(4) Frequency (f) of the source ,
            $I\propto f$ ,
(5) Density ($\rho$) of the medium  ,
          $I\propto \rho$ , 
(6) Motion of the medium , which changes the effective speed of sound .

The walls of the auditorium built for musical concerts should be such  that they are able to ______ sound. Fill in the banks.

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

  1. Transmit

  2. Refract

  3. Reflect

  4. Absorb

Show answer
Correct Option: D
Explanation:

The walls of the auditorium should be equipped with good absorbing material , otherwise sound waves coming back after reflection from different walls may produce interference , constructive interference at any place in auditorium will produce a loud sound whereas distructive interference at any place in auditorium will produce a faint sound , making the music unpleasant .