173065
A source of sound moves towards an observer with a velocity $108 \mathrm{~km} / \mathrm{h}$ and the observer also moves towards the source with the velocity 5 $\mathrm{km} / \mathrm{h}$, then the velocity of sound is
1 $320 \mathrm{~m} / \mathrm{s}$
2 $330 \mathrm{~m} / \mathrm{s}$
3 $340 \mathrm{~m} / \mathrm{s}$
4 Data insufficient
Explanation:
D The observed and emitted frequencies are required for calculating the velocity of sound. So, data insufficient for calculate the velocity of sound.
UP CPMT-2010
WAVES
173092
A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with
1 a phase change of $180^{\circ}$ with velocity reversed
2 the same phase as the incident pulse with no reversal of velocity
3 a phase change of $180^{\circ}$ with no reversal of velocity
4 the same phase as the incident pulse but with velocity reversed
Explanation:
A When a pulse of wave train when travels along a stretched string and reaches the fixed end of the string, then it will be reflected to the same medium and the reflected ray suffers a phase change of $180^{\circ}$ with the incident wave and wave velocity after reflection reverse its direction.
AIPMT-1997
WAVES
173093
What is the effect of humidity on sound waves when humidity increases?
1 Speed of sound waves increases
2 Speed of sound waves decreases
3 Speed of sound waves remains same
4 Speed of sound waves becomes zero
Explanation:
A The speed of sound in air increases with the increases in humidity, because the density of humid air is less than the density of dry air As the density of the medium decrease the speed of sound in the medium increases.
AIPMT-1996
WAVES
173102
An observer is approaching with velocity $v$ towards a light source. If the velocity of light is c, then velocity of light with respect to observer will be
1 $\mathrm{c}-\mathrm{v}$
2 $\mathrm{c}$
3 $\mathrm{c}+\mathrm{v}$
4 $\sqrt{1-v^{2} / c^{2}}$
Explanation:
B The velocity of light is a universal constant. and hence it is same for both stationary and any moving observer. However, both frequency and wavelength of observed light may change for different moving observer, keeping the speed of light constant which is equal to c (speed of light).
173065
A source of sound moves towards an observer with a velocity $108 \mathrm{~km} / \mathrm{h}$ and the observer also moves towards the source with the velocity 5 $\mathrm{km} / \mathrm{h}$, then the velocity of sound is
1 $320 \mathrm{~m} / \mathrm{s}$
2 $330 \mathrm{~m} / \mathrm{s}$
3 $340 \mathrm{~m} / \mathrm{s}$
4 Data insufficient
Explanation:
D The observed and emitted frequencies are required for calculating the velocity of sound. So, data insufficient for calculate the velocity of sound.
UP CPMT-2010
WAVES
173092
A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with
1 a phase change of $180^{\circ}$ with velocity reversed
2 the same phase as the incident pulse with no reversal of velocity
3 a phase change of $180^{\circ}$ with no reversal of velocity
4 the same phase as the incident pulse but with velocity reversed
Explanation:
A When a pulse of wave train when travels along a stretched string and reaches the fixed end of the string, then it will be reflected to the same medium and the reflected ray suffers a phase change of $180^{\circ}$ with the incident wave and wave velocity after reflection reverse its direction.
AIPMT-1997
WAVES
173093
What is the effect of humidity on sound waves when humidity increases?
1 Speed of sound waves increases
2 Speed of sound waves decreases
3 Speed of sound waves remains same
4 Speed of sound waves becomes zero
Explanation:
A The speed of sound in air increases with the increases in humidity, because the density of humid air is less than the density of dry air As the density of the medium decrease the speed of sound in the medium increases.
AIPMT-1996
WAVES
173102
An observer is approaching with velocity $v$ towards a light source. If the velocity of light is c, then velocity of light with respect to observer will be
1 $\mathrm{c}-\mathrm{v}$
2 $\mathrm{c}$
3 $\mathrm{c}+\mathrm{v}$
4 $\sqrt{1-v^{2} / c^{2}}$
Explanation:
B The velocity of light is a universal constant. and hence it is same for both stationary and any moving observer. However, both frequency and wavelength of observed light may change for different moving observer, keeping the speed of light constant which is equal to c (speed of light).
173065
A source of sound moves towards an observer with a velocity $108 \mathrm{~km} / \mathrm{h}$ and the observer also moves towards the source with the velocity 5 $\mathrm{km} / \mathrm{h}$, then the velocity of sound is
1 $320 \mathrm{~m} / \mathrm{s}$
2 $330 \mathrm{~m} / \mathrm{s}$
3 $340 \mathrm{~m} / \mathrm{s}$
4 Data insufficient
Explanation:
D The observed and emitted frequencies are required for calculating the velocity of sound. So, data insufficient for calculate the velocity of sound.
UP CPMT-2010
WAVES
173092
A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with
1 a phase change of $180^{\circ}$ with velocity reversed
2 the same phase as the incident pulse with no reversal of velocity
3 a phase change of $180^{\circ}$ with no reversal of velocity
4 the same phase as the incident pulse but with velocity reversed
Explanation:
A When a pulse of wave train when travels along a stretched string and reaches the fixed end of the string, then it will be reflected to the same medium and the reflected ray suffers a phase change of $180^{\circ}$ with the incident wave and wave velocity after reflection reverse its direction.
AIPMT-1997
WAVES
173093
What is the effect of humidity on sound waves when humidity increases?
1 Speed of sound waves increases
2 Speed of sound waves decreases
3 Speed of sound waves remains same
4 Speed of sound waves becomes zero
Explanation:
A The speed of sound in air increases with the increases in humidity, because the density of humid air is less than the density of dry air As the density of the medium decrease the speed of sound in the medium increases.
AIPMT-1996
WAVES
173102
An observer is approaching with velocity $v$ towards a light source. If the velocity of light is c, then velocity of light with respect to observer will be
1 $\mathrm{c}-\mathrm{v}$
2 $\mathrm{c}$
3 $\mathrm{c}+\mathrm{v}$
4 $\sqrt{1-v^{2} / c^{2}}$
Explanation:
B The velocity of light is a universal constant. and hence it is same for both stationary and any moving observer. However, both frequency and wavelength of observed light may change for different moving observer, keeping the speed of light constant which is equal to c (speed of light).
173065
A source of sound moves towards an observer with a velocity $108 \mathrm{~km} / \mathrm{h}$ and the observer also moves towards the source with the velocity 5 $\mathrm{km} / \mathrm{h}$, then the velocity of sound is
1 $320 \mathrm{~m} / \mathrm{s}$
2 $330 \mathrm{~m} / \mathrm{s}$
3 $340 \mathrm{~m} / \mathrm{s}$
4 Data insufficient
Explanation:
D The observed and emitted frequencies are required for calculating the velocity of sound. So, data insufficient for calculate the velocity of sound.
UP CPMT-2010
WAVES
173092
A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with
1 a phase change of $180^{\circ}$ with velocity reversed
2 the same phase as the incident pulse with no reversal of velocity
3 a phase change of $180^{\circ}$ with no reversal of velocity
4 the same phase as the incident pulse but with velocity reversed
Explanation:
A When a pulse of wave train when travels along a stretched string and reaches the fixed end of the string, then it will be reflected to the same medium and the reflected ray suffers a phase change of $180^{\circ}$ with the incident wave and wave velocity after reflection reverse its direction.
AIPMT-1997
WAVES
173093
What is the effect of humidity on sound waves when humidity increases?
1 Speed of sound waves increases
2 Speed of sound waves decreases
3 Speed of sound waves remains same
4 Speed of sound waves becomes zero
Explanation:
A The speed of sound in air increases with the increases in humidity, because the density of humid air is less than the density of dry air As the density of the medium decrease the speed of sound in the medium increases.
AIPMT-1996
WAVES
173102
An observer is approaching with velocity $v$ towards a light source. If the velocity of light is c, then velocity of light with respect to observer will be
1 $\mathrm{c}-\mathrm{v}$
2 $\mathrm{c}$
3 $\mathrm{c}+\mathrm{v}$
4 $\sqrt{1-v^{2} / c^{2}}$
Explanation:
B The velocity of light is a universal constant. and hence it is same for both stationary and any moving observer. However, both frequency and wavelength of observed light may change for different moving observer, keeping the speed of light constant which is equal to c (speed of light).
