Tag: applications of ultrasound

Questions Related to applications of ultrasound

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

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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.

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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

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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

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Correct Option: B
Explanation:

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

For good absorption of sound in auditorium it requires

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

  1. a few windows to be opened

  2. all closed windows

  3. maps hanging from walls

  4. hanging light curtains.

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Correct Option: A
Explanation:

A few window should be kept opened for the good absorption of sound in auditorium. Because if we open few windows, more sound will absorbed and more will be the sound clarity and better sound effect can be experienced. 

In an auditorium the big curtain when falls suddenly then the reverberation time

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

  1. increases

  2. decreases

  3. Remains same

  4. becomes zero

Show answer
Correct Option: B
Explanation:

The reverberation time will get decreased because curtain will abrosh the sound and more sound will get abrashed then the earlier.