Tag: study of sound

Questions Related to study of sound

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physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Good reflectors of sound-Tiles, Marble slabs

  2. Bad reflectors of sound - Thick curtains, thick carpets

  3. Good absorbers of sound - Holed cardboard

  4. All

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Correct Option: D
Explanation:

Sound is not reflected equally from different materials. Hard surfaces reflects more sound.
Bad reflectors of sound are good absorbers. Soft thick curtains, thick carpets, holed card boards are examples of good absorbers of sound.

Identify the device which work on the reflection of sound.

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Megaphone

  2. Stethoscope

  3. Sound boards

  4. All of the above

Show answer
Correct Option: D
Explanation:

Megaphone, Stethoscope and Sound boards work on the reflection of sound.

$1.$Megaphone is a portable, cone shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction.
$2.$Stethoscope is an acoustic medical device for listening to the internal sounds of an animal or human body.
$3.$Sound board is the surface of a string instrument that the string vibrate against.

Which of the following are examples of multiple reflections of sound?

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Stethoscope

  2. Sound board

  3. Megaphone

  4. All of the above

Show answer
Correct Option: D
Explanation:

Process in which sound waves bounces off obstacles and reflects many times before reaching destinations is known as multiple reflection of sound, So, all of the above are examples of multiple reflections of sound

What is multiple reflection of sound?

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Process in which sound waves bounces off obstacles and reflects many times before reaching destinations

  2. Process in which sound waves penetrates in obstacles and reflects many times before reaching destinations

  3. Process in which sound waves bounces off obstacles and deflects one time before reaching destinations

  4. None

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Correct Option: A
Explanation:

Process in which sound waves bounces off obstacles and reflects many times before reaching destinations is known as multiple reflection of sound

The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________.

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. reflection

  2. echo

  3. reverberation

  4. rarefaction

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Correct Option: C
Explanation:

In big rooms or halls,echos (due to multiple reflection of sound from the walls, roof, floor) follow so closely behind the original sound that the original sound appears to be prolonged even when the source of sound stops producing sound.

Why do distant sounds such as those of traffic and loudspeakers become louder during the night time than during the day time?

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Due to the reflection of sound waves.

  2. Due to the refraction of sound waves.

  3. Due to the absence of other sounds.

  4. Due to a clear perception of hearing.

Show answer
Correct Option: A
Explanation:

Sound waves travel differently at night than during the day. During the day, the sound bends away from the ground;during the night, it bends towards the ground. 

In an unoccupied hall of a choultry you will experience the echo effect of sound. If the same hall is furnished with almirahs, tables, chairs,and other commodities, you may not experience the echo clearly. It is because, 

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Sound waves get absorbed by the objects in the hall.

  2. The area of reflecting surface decreases.

  3. Reflected sound is reflected again.

  4. Sound does not get reflected again.

Show answer
Correct Option: A
Explanation:

echo is heard due to reflection of sound and if obstacles are placed in path of sound then they will either absorb sound or will not perfectly reflect sound as before so echo will be not effective one .

so the answer is A.

The persistence of sound in a closed enclosure, due to continuous reflections at the walls, even after the source has stopped producing sound is known as

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. The persistence of hearing

  2. An echo

  3. Reverberation

  4. The ultra sounds

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Correct Option: C
Explanation:

Reverberation is the phenomenon of persistence of sound in a closed enclosure, due to multiple reflection of sound from the walls, even after the source has stopped producing sound. The intensity of sound gets reduced after each reflection.

Select the instrument that works on the principle of multiple reflection of sound.

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. Watthour meter

  2. Sonar

  3. Stethoscope

  4. Decibel meter

Show answer
Correct Option: C
Explanation:

The sound of a heartbeat ( or lungs ) reaches the doctor's ears by the multiple reflections of sound waves though the stethoscope tube.

Perforated card boards are used in halls, for

physics study of sound reverberation applications of reflection of sound multiple reflection of sound and reverberation applications of ultrasound

  1. reflection of sound

  2. absorption of sound

  3. refraction of sound

  4. as a decorative material

Show answer
Correct Option: B
Explanation:

Perforated card boards are used for the absorption of sound, as they are good sound absorbents and decrease reverberation time.