Miscellaneous Problems on Waves
PHXI15:WAVES

354791 An aluminium wire is clamped at each end and under zero tension at room temperature. Reducing the temperature, the tension in the wire is found to be increased (as length decreases). The wire is plucked. The resulting strain was found to be \({\rho ^a}{v^b}{Y^c}\) in the vibrating wire; where \(\rho \): density, \(v\) : velocity of wave in the string, \(y\) : Young's modulus. The value \(\frac{{ac}}{b} + \frac{{bc}}{a} = \)

1 1.4
2 3.7
3 2.5
4 6.3
PHXI15:WAVES

354792 Assertion :
Beats can also be observed by two laser light sources as in sound.
Reason :
Laser light sources have constant phase difference.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI15:WAVES

354793 A pendulum vibrates with a time period of
1 second. The sound produced in it is in the range of

1 supersonic
2 ultrasonic
3 audible
4 infrasonic
PHXI15:WAVES

354794 An ant with mass \(m\) is standing peacefully on top of a horizontal, stretched rope. The rope has mass per unit length \(\mu\) and is under tension \(F\). Without warning, a student starts a sinusoidal transverse wave of wavelength \(\lambda\) propagating along the rope. The motion of the rope is in a vertical plane. What minimum wave amplitude will make the ant feel weightless momentarily? Assume that \(m\) is so small that the presence of the ant has no effect on the propagation of the wave.
[Given: \(\lambda=0.5 {~m}, \mu=0.1 {~kg} / {m}, F=3.125 {~N}\), take \(g=\pi^{2}\) ]

1 \(2\,mm\)
2 \(6\,mm\)
3 \(9\,mm\)
4 \(1\,mm\)
PHXI15:WAVES

354791 An aluminium wire is clamped at each end and under zero tension at room temperature. Reducing the temperature, the tension in the wire is found to be increased (as length decreases). The wire is plucked. The resulting strain was found to be \({\rho ^a}{v^b}{Y^c}\) in the vibrating wire; where \(\rho \): density, \(v\) : velocity of wave in the string, \(y\) : Young's modulus. The value \(\frac{{ac}}{b} + \frac{{bc}}{a} = \)

1 1.4
2 3.7
3 2.5
4 6.3
PHXI15:WAVES

354792 Assertion :
Beats can also be observed by two laser light sources as in sound.
Reason :
Laser light sources have constant phase difference.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI15:WAVES

354793 A pendulum vibrates with a time period of
1 second. The sound produced in it is in the range of

1 supersonic
2 ultrasonic
3 audible
4 infrasonic
PHXI15:WAVES

354794 An ant with mass \(m\) is standing peacefully on top of a horizontal, stretched rope. The rope has mass per unit length \(\mu\) and is under tension \(F\). Without warning, a student starts a sinusoidal transverse wave of wavelength \(\lambda\) propagating along the rope. The motion of the rope is in a vertical plane. What minimum wave amplitude will make the ant feel weightless momentarily? Assume that \(m\) is so small that the presence of the ant has no effect on the propagation of the wave.
[Given: \(\lambda=0.5 {~m}, \mu=0.1 {~kg} / {m}, F=3.125 {~N}\), take \(g=\pi^{2}\) ]

1 \(2\,mm\)
2 \(6\,mm\)
3 \(9\,mm\)
4 \(1\,mm\)
PHXI15:WAVES

354791 An aluminium wire is clamped at each end and under zero tension at room temperature. Reducing the temperature, the tension in the wire is found to be increased (as length decreases). The wire is plucked. The resulting strain was found to be \({\rho ^a}{v^b}{Y^c}\) in the vibrating wire; where \(\rho \): density, \(v\) : velocity of wave in the string, \(y\) : Young's modulus. The value \(\frac{{ac}}{b} + \frac{{bc}}{a} = \)

1 1.4
2 3.7
3 2.5
4 6.3
PHXI15:WAVES

354792 Assertion :
Beats can also be observed by two laser light sources as in sound.
Reason :
Laser light sources have constant phase difference.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI15:WAVES

354793 A pendulum vibrates with a time period of
1 second. The sound produced in it is in the range of

1 supersonic
2 ultrasonic
3 audible
4 infrasonic
PHXI15:WAVES

354794 An ant with mass \(m\) is standing peacefully on top of a horizontal, stretched rope. The rope has mass per unit length \(\mu\) and is under tension \(F\). Without warning, a student starts a sinusoidal transverse wave of wavelength \(\lambda\) propagating along the rope. The motion of the rope is in a vertical plane. What minimum wave amplitude will make the ant feel weightless momentarily? Assume that \(m\) is so small that the presence of the ant has no effect on the propagation of the wave.
[Given: \(\lambda=0.5 {~m}, \mu=0.1 {~kg} / {m}, F=3.125 {~N}\), take \(g=\pi^{2}\) ]

1 \(2\,mm\)
2 \(6\,mm\)
3 \(9\,mm\)
4 \(1\,mm\)
PHXI15:WAVES

354791 An aluminium wire is clamped at each end and under zero tension at room temperature. Reducing the temperature, the tension in the wire is found to be increased (as length decreases). The wire is plucked. The resulting strain was found to be \({\rho ^a}{v^b}{Y^c}\) in the vibrating wire; where \(\rho \): density, \(v\) : velocity of wave in the string, \(y\) : Young's modulus. The value \(\frac{{ac}}{b} + \frac{{bc}}{a} = \)

1 1.4
2 3.7
3 2.5
4 6.3
PHXI15:WAVES

354792 Assertion :
Beats can also be observed by two laser light sources as in sound.
Reason :
Laser light sources have constant phase difference.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI15:WAVES

354793 A pendulum vibrates with a time period of
1 second. The sound produced in it is in the range of

1 supersonic
2 ultrasonic
3 audible
4 infrasonic
PHXI15:WAVES

354794 An ant with mass \(m\) is standing peacefully on top of a horizontal, stretched rope. The rope has mass per unit length \(\mu\) and is under tension \(F\). Without warning, a student starts a sinusoidal transverse wave of wavelength \(\lambda\) propagating along the rope. The motion of the rope is in a vertical plane. What minimum wave amplitude will make the ant feel weightless momentarily? Assume that \(m\) is so small that the presence of the ant has no effect on the propagation of the wave.
[Given: \(\lambda=0.5 {~m}, \mu=0.1 {~kg} / {m}, F=3.125 {~N}\), take \(g=\pi^{2}\) ]

1 \(2\,mm\)
2 \(6\,mm\)
3 \(9\,mm\)
4 \(1\,mm\)