Tag: waves

Questions Related to waves

Equation ${ y } _{ 1 }=0.1sin\left( 100\pi t+\dfrac { \pi  }{ 3 }  \right) $ and ${ y } _{ 2 }=0.1$ cos $\pi t$ The phase difference of the velocity of particle 1, with respect to the velocity of particle 2 is 

  1. $\dfrac { -\pi }{ 6 } $

  2. $\dfrac { \pi }{ 3 }$

  3. $\dfrac { -\pi }{ 3 } $

  4. $\dfrac { \pi }{ 6 } $


Correct Option: A

Which of the following equations does not represent a progressive wave ?

  1. $y=Asin[\omega (t-\frac { x }{ v } )]$

  2. $y=Asin[ \frac { 2pi }{ \lambda }(vt-x)] $

  3. $y=Asin[2\pi (\frac {t}{T}-\frac { x }{ \lambda } )]$

  4. $y=Asin[2\pi (\frac {t}{T}-\frac { x }{ v } )]$


Correct Option: D

A traveling wave is represented by the equation $ y = \frac{1}{10} sin(60 t + 2x) $, where x and y in meters and t is in second . this represents a wave
(1) of frequency $ \frac {30}{\pi} Hz $
(2) of wavelength $ \pi m $
(3)of amplitude 10 cm
(4) moving in the positive x direction
pick out the correct statements from the above.

  1. 1, 2, 4

  2. 1, 3, 4

  3. 1, 2, 3

  4. all


Correct Option: C

A wave equation which given the displacement along the Y direction is given by $y = 10^{-4} \sin (60t+2x)$ where x and y are in meters and t is time in seconds. This represents a wave 

  1. Traveling with a velocity of 30 m/s in the negative x direction

  2. Of wavelength $\pi $ metre

  3. Of frequency 30/$\pi $hertz

  4. Of amplitude $10^{ -4 }$ metre


Correct Option: A,B,C,D

For a wave $ y= y _0 sin ( \omega t - kx ) $, for what value of $ \lambda $ , is the maximum particle velocity equal to two times the wave velocity :-

  1. $ \pi y _0 $

  2. $ 2 \pi y _0 $

  3. $ \pi y _0/2 $

  4. $4 \pi y _0 $


Correct Option: A

Two small boats are 10 m apart on a lake. Each pops up and down with a period of 4.0  seconds due  to wave motion on the surface of water. What one boat is at its highest point, the other boat is at lowest point. Both boats are always within a single cycle of the waves. The speed of the waves is : 

  1. 2.5 m/s

  2. 5.0 m/s

  3. 14 m/s

  4. 40 m/s


Correct Option: B

Consider the following two equations $L=I\omega$ and $ \dfrac { dL }{ dt } =\Gamma $. In noninertial frames :

  1. both A and B are true

  2. A is true but B is false

  3. B is true but A is false

  4. both A and B are false.


Correct Option: B

The equation $y = a \sin^2 \left(2 \pi nt - \dfrac{2\pi x}{\lambda}\right)$ represents a wave with

  1. Amplitude $a$, frequency $n$ and wavelength $\lambda$

  2. Amplitude $a$, frequency $2n$ and wavelength $2\lambda$

  3. Amplitude $a/2$, frequency $2n$ and wavelength $\lambda$

  4. Amplitude $a/2$, frequency $2n$ and wavelength $\lambda/2$


Correct Option: D

The speed of the wave travelling on the uniform circular hoop of string, rotating clockwise in absence of gravity with tangential speed $v _0$, is :

  1. $v=v _0$

  2. $v=2v _0$

  3. $v=\dfrac{v _0}{\sqrt 3}$

  4. $v=\dfrac{v _0}{2}$


Correct Option: A

The equation $y =A\cos^2\left(2\pi\, nt -2\pi \dfrac{x}{\lambda}\right)$ represents a wave with

  1. amplitude $A/2$, frequency $2n$& wavelength $\lambda/2$

  2. amplitude $A/2$, frequency $2n$& wavelength $\lambda$

  3. amplitude $A$, frequency $2n$& wavelength $2\lambda$

  4. amplitude $A$, frequency $n$& wavelength $\lambda$


Correct Option: A