Question 1 : Two increase the frequency from <img style='object-fit:contain' width=46 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea14b701ac76a0b860fb811"> to <img style='object-fit:contain' width=46 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea14bbe27ce131ff7c061d3"> the tension in the string has to be changed by
Question 4 :
If you set up the seven overtone on a string fixed at both ends, how many nodes and antinodes are set up in it?
Question 5 :
With what velocity an observer should move relative to a stationary source so that he hears a sound of double the frequency of source
Question 6 :
The type of waves that can be propagated through solid is
Question 7 :
When a longitudinal wave propagates through a medium, the particles of the medium execute simple harmonic oscillations about their mean positions. These oscillations of a particle are characterised by an invariant
Question 8 :
A source of sound emitting a tone of frequency 200 Hz moves towards an observer with a velocity <i>v </i>equal to the velocity of sound. If the observer also moves away from the source with the same velocity <i>v, </i>the apparent frequency heard by the observer is
Question 9 :
If the wavelength of a wave is decreased by $20\mbox{%}$ then its frequency will become :<br/>
Question 10 :
A transverse wave has amplitude A and travels with speed 2 m/s and wavelength is 8 m. At t=0, a particular point of wave has a vertical displacement +A, find the time when vertical displacement of this same point be -A.
Question 11 :
Stationary wave is represented by $Y=A\sin{(100t)}\cos {(0.01x)}$ where $y$ and $A$ are in $mm$, $t$ in sec and $x$ in $m$. The velocity of the wave:
Question 12 :
The frequency of light ray having the wavelength $3000\ A^o$ is
Question 13 :
At t = 0, a transverse wave pulse in wire is described by the function;<br>$\displaystyle\,y\,=\,\frac{6}{x^{2}\,+\,3}$<br>Where x and y are in meters. Write the function y(x,t) that describes this wave if it travelling in the positive x-direction with a speed of 4.50 m/s.
Question 14 :
If the frequency of a sound wave is increased by 25%, then the change in its wavelength will be
Question 15 :
The time needed for two complete cycles of vibration is called time period
Question 16 :
Vibrations of period 0.25 s propagate along a straight line at a velocity of 48 cm/s. One second after the emergence of vibrations at the initial point, displacement of the point, 47 cm from it is found to be 3 cm. Then,
Question 17 :
A plane progressive wave travelling in -Y direction is represented by the equation $2\cos (2\pi t+\pi y)$. If this wave was travelling in X direction, the frequency of the wave would have been
Question 18 :
The periodic time of a vibrating body is 0.01 sec. Its frequency will be
Question 20 : <p>Two waves of frequencies <b>20 Hz</b> and <b>30 Hz</b> travels out from a common point. The phase difference between them after <b>0.6 sec</b> is</p>
Question 21 :
n waves are produced on a string in 1 s. When the radius of the string is doubled and the tension is maintained the same, the number of waves produced in 1 s for the same harmonic will be
Question 22 :
A wave of wavelength 4 mm is produced in air and it travels at a speed of 300 m/s. Will it be audible?
Question 23 :
A piece of wire is cut into two pieces $A$ and $B$ and stretched to the same tension and mounted between two rigid walls. Segment $A$ is longer than segment $B$. Which of the following quantities will always be larger for waves on $A$ than for waves on $B$:
Question 24 :
A wave is represented by the equation $y = [A sin ({10x + 15 t + \dfrac{1}{3}})]$ where $x$ is in meters and $t$ is in seconds. The expression represents<br/>
Question 25 :
The path difference between two waves<br>$y_{1} = a_{1}\sin \left (\omega t - \dfrac {2\pi x}{\lambda}\right )$ and<br>$y_{2} = a_{2}\cos \left (\omega t - \dfrac {2\pi x}{\lambda} +\phi \right )$ is
Question 26 :
A wave represented by equation $y = 2(mm) \, sin \, [4 \pi (sec^{-1}) t - 2 \pi (m^{-1}) X]$ is superimposed with another wave $y = 2 (mm) sin [4 \pi (sec^{-1}) t + 2 \pi (m^{-1}) x + \pi/3]$ on a tight string.<br>Phase difference between two particles with are located at $x_1 = 1/7$ and $x_2 = 5/12$ is :
Question 27 :
The equation of a progressive wave is given by $y=2 sin (5\pi t-3x)$.What is the time period of the wave. t is measured in secs and x in meters
Question 28 :
A sinusoidal progressive wave is generated in a string. It's equation is given by $y=(2 mm)   \sin (2\pi x - 100\pi t + \pi/3).$ The time when particle at $x = 4 m$ first passes through mean position, will be 
Question 29 :
The equation of a progressive wave are $Y=\sin{\left[200\pi\left(t-\cfrac{x}{330}\right)\right]}$, where $x$ is in meter and f is second. The frequency and velocity of wave are
Question 30 :
The frequency of a man's voice is 300 Hz and its wavelength is 1 meter. If the wavelength of a child's voice is 1.5 m, then the frequency of the child's voice is :<br>
Question 31 :
A transverse wave travels along the Z-axis. The particles of the medium must move
Question 32 :
Find the size of object which can be featured with $5\space MHz$ in water.
Question 33 :
The frequency of fork is 512 Hz and the sound produced by it travels 42 metres as the tuning fork completes 64 vibrations. Find the velocity of sound :<br/>
Question 34 :
Two identical piano wires kept under the same tension T have a fundamental frequency of 600{tex} \mathrm { Hz } {/tex} . The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be
Question 35 :
A wave of frequency 500 Hz has a phase velocity of 360 m/s. The phase difference between the two displacements at a certain point in a time interval of 10$^{-3}$ seconds will be how much?
Question 36 :
Equations of a stationary wave and a travelling wave are ${ y }_{ 1 } = a\ sinkx\ cos \omega t$ and ${ y }_{ 2 } = a\ sin (\omega t - kx)$. The phase difference between two points ${ x }_{ 1 }\ =\ \dfrac { \pi }{ 3k } \ and\ { x }_{ 2 }\ =\ \dfrac { 3\pi }{ 2k } \ is\ { \phi }_{ 1 }$ for the first wave and ${ \phi }_{ 2 }$ for the second wave. The ratio $\dfrac { { \phi }_{ 1 } }{ { \phi }_{ 2 } }$ is :
