Tag: study of sound

Quizzes (14) Questions (314)

Questions Related to study of sound

Multiple choice physics study of sound determination of speed of sound by echo problems on sound sound needs a medium

A boy shouts while standing in front of a hill. He hears an echo after 6 sec. If the speed of sound  in air is 340 m/s. What is the distance of the hill from the position of the body?

  1. 519 m

  2. 1020 m

  3. 2040 m

  4. none
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let distance of hill from the position of the body = d
Echo is heard after 6 sec
$d = v \dfrac{t}{2}$
$= \dfrac{(340 \times 6)}{2}$
$= 1020 m$

Multiple choice physics study of sound determination of speed of sound by echo problems on sound sound needs a medium

A sonar echo takes 8.8 s to return from a shack. How far away is the shack?

Given speed of sound in sea-water = 1533 m/s

  1. 348 m

  2. 5720 m

  3. 6745 m

  4. 13490 m
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let $d$ be the distance of shack from the sonar . Therefore  distance covered by sound to come back to sonar after reflection from shack ,  $=d$ ,

given , speed of sound in sea water $v=1533m/s  ,  t=8.8s$ ,
we have , distance=speed$\times time$ ,
               $d=v\times t=1533\times8.8$ ,
or            $d=13490.4m$

Multiple choice how humans hear sound human ear study of sound sound physics

Combination of notes that produced jarring effect on the ear is called

  1. discord

  2. harmony

  3. noise

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

Combination of notes that produced jarring effect on the ear is called discord. Discord is lack of harmony between notes sounding together.

Multiple choice how humans hear sound human ear study of sound sound physics

The persistence of hearing of human beings is not more than ________.

  1. 1 s
  2. $\displaystyle \frac{1}{5}$ s
  3. $\displaystyle \frac{1}{10}$ s
  4. $\displaystyle \frac{1}{2}$ s
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sensation of hearing of any sound persists in our brain is 0.1 s. This is called the persistence of hearing. The persistence of hearing of human beings is not more than $\frac{1}{5}\,s$

Multiple choice how humans hear sound human ear study of sound sound physics

State whether true or false.

Vibration of the ear drum produces sensation of sound in the ears.

  1. True

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

The sound waves produces vibration of the ear drum and subsequently a forceful vibration of the bones of the middle ear. This high amplitude vibration is transmitted to the fluid of the inner ear and encoded in the nerve signal which is sent to the brain.

Multiple choice how humans hear sound human ear study of sound sound physics

Select the loudness level that is above the normal hearing range

  1. 150 decibels

  2. 40 decibels

  3. 70 decibels

  4. 90 decibels
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In order for us to be able to hear a sound at all, it has to be above a certain level. This level is called the auditory threshold or hearing threshold. Humans have a hearing threshold of around $0$ decibels. Above this threshold, sounds with higher sound pressure levels are heard as louder noises. Sounds above $90\, dB$ can lead to chronic hearing damage if people are exposed to them every day or all the time. Hearing becomes uncomfortable if the sound pressure level is above $110$ decibels (threshold of discomfort), and it becomes painful above $130$ decibels (threshold of pain).

Multiple choice how humans hear sound human ear study of sound sound physics

Sound from the outside world reach the inner ear through:

  1. pinna

  2. cochlea

  3. auditory canal

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

Sound from the outside world are collected by pinna and reach the inner ear through auditory canal.

Multiple choice how humans hear sound human ear study of sound sound physics

The sound waves starts vibrating when it reaches:

  1. pinna

  2. stirrup

  3. tympanic membrane

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

When the sound waves strike the eardrum or tympanic membrane it starts vibrating. Sound from the outside world are collected by pinna and reach the eardrum through auditory canal.