Tag: study of sound

Quizzes (14) Questions (314)

Questions Related to study of sound

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

A longitudinal wave consists of :

  1. crest and trough in the medium

  2. compression and rarefraction in the medium

  3. both (a) & (b)

  4. nither (a) nor (b)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A longitudinal wave is characterized by the displacement of particles parallel to the direction of wave propagation, creating regions of compression and rarefaction. Crests and troughs are features of transverse waves.

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

Find the incorrect statement

  1. Ultrasound can be used to determine the sex of the unborn baby (embryo)

  2. Ultrasound can be used to keep away rodents in cold storage

  3. Ultrasound can be used to detect even bone fractures

  4. Ultrasound travels faster than sound
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

Ultrasound frequency used for imaging is about $5 MHz.$
The corresponding wavelength is $\lambda = \dfrac{v}{\nu}=\dfrac{1540 \text{m/s}}{5\times 10^6} = 0.3mm$ 
Here speed of ultrasound in tissue is taken to be $1540 m/s$.
So ultrasound can not be used for bone fractures as it bone fracture can have size of few microns.
Ultrasound does not travel faster than sound. Sound speed does not depend on frequency.
$v=\nu \lambda$ if $\nu$ is higher, $\lambda$ becomes smaller and $v$ remains constant.

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

A metal bar clamped at its center resonates in its fundamental mode to produce longitudinal waves of frequency 4 kHz.Now the clamp is moved to one end. If ${f _1}\;{\text{and}}\;{f _2}$ be the frequencies of first overtone and second overtone respectively then, 

  1. $3{f _2} = 5{f _1}$
  2. ${f _2} = 2{f _1}$
  3. $3{f _1} = 5{f _2}$
  4. $2{f _2} = {f _1}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$\begin{array}{l} { f _{ 1 } }=3f \ { f _{ 2 } }=5f \ \Rightarrow 5{ f _{ 1 } }=3{ f _{ 2 } } \ Hence, \ option\, \, A\, \, is\, \, correct\, \, answer. \end{array}$

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

In a stationary wave represented by $y = a \sin wt \cos kx$, amplitude of the component progressive wave is

  1. $\frac{a}{2}$
  2. $a$
  3. $2a$
  4. $a^2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A stationary wave y = a sin(wt) cos(kx) can be written as the sum of two progressive waves: y = (a/2) sin(wt - kx) + (a/2) sin(wt + kx). Therefore, the amplitude of each component wave is a/2.

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

Which of the following equations represents a wave travelling along  $Y$-axis ?

  1. $x = A \sin ( k y - \omega t )$
  2. $y = A \sin ( k x - \omega t )$
  3. $y = A \sin k y \cos \omega t$
  4. $y = A \cos k y \sin \omega t$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A wave traveling along the Y-axis must have its displacement as a function of (y +/- vt). Option A represents a wave where the displacement x is a function of (y - vt).

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

State whether the given statement is True or False :

If a pebble is thrown into the water the ripples on the surface of water are created due to translatory motion of the water particles.

  1. True

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

when the pebble is thrown in water the disturbance created travels in all outwards directions over the surface of the water in the form of ripples these ripples are circular in shape .

so the statement is false .
so answer is B.

Multiple choice physics study of sound types of waves sound as a wave of disturbance sound waves are longitudinal waves

When a tuning fork vibrates, the waves produced in the stem are:

  1. longitudinal

  2. transverse

  3. both (a) and (b)

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When tuning fork is sounded by striking its one end then the prongs vibrate in and out and stem vibrate up and down. Hence, vibration of prongs are transverse and those of stem are longitudinal. 

Hence Option A is correct