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Question
A wall is moving with velocity u and a source of sound moves with velocity u/2 in the same direction as shown in the figure. Assuming that the sound travels with velocity 10u. The ratio of incident sound wavelength on the wall to the reflected sound wavelength by the wall, is equal to
- 9:11
- 11:9
- 4:5
- 5:4
The correct answer is: 9:11
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In the figure shown a source of sound of frequency 510 Hz moves with constant velocity vs = 20 m/s in the direction shown. The wind is blowing at a constant velocity vw = 20 m/s towards an observer who is at rest at point B. Corresponding to the sound emitted by the source at initial position A, the frequency detected by the observer is equal to (speed of sound relative to air = 330 m/s)
In the figure shown a source of sound of frequency 510 Hz moves with constant velocity vs = 20 m/s in the direction shown. The wind is blowing at a constant velocity vw = 20 m/s towards an observer who is at rest at point B. Corresponding to the sound emitted by the source at initial position A, the frequency detected by the observer is equal to (speed of sound relative to air = 330 m/s)
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A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5 m/sec. If sound travels at a speed of 330 m/sec, then number of beats per second heard by an observer between the wall and the source is:
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Physics-General
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y - x curve at an instant for a wave travelling along x axis on a string is shown. Slope at the point A on the curve, as shown, is 53°.
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For a certain transverse standing wave on a long string, an antinode is formed at x = 0 and next to it, a node is formed at x = 0.10 m. the displacement y(t) of the string particle at x = 0 is shown in figure
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Physics-General
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A wire, under tension between two fixed points A and B, executes transverse vibrations so that the midpoint O of AB is a node. Then:
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There are three strings RP, PQ and QS as shown. Their mass and lengths are RP = (0.1Kg, 2m), PQ = (0.2 Kg, 3 m), QS = (0.15 Kg, 4 m) respectively. All the strings are under same tension. Wave-1 is incident at P. It is partly reflected (wave-2) and partly transmitted (wave-3). Now wave-3 is incident at Q. It is again partly transmitted (wave-5) and partly reflected (wave-4). Phase difference between wave-1 and wave :
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The figure shows at time t = 0 second, a rectangular and triangular pulse on a uniform wire are approaching each other. The pulse speed is 0.5 cm/s. The resultant pulse at t = 2 second is
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A string of length ‘
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Physics-General
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A wave pulse is generated in a string that lies along x-axis. At the points A and B, as shown in figure, if RA and RB are ratio of wave speed to the particle speed respectively then :
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The displacement Vs time graph for two waves A and B which travel along the same string are shown in the figure. Their intensity ratio IA /IB is
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Two trains A and B are moving with speed 20 m/s and 30 m/s respectively in the same direction on the same straight track, with B ahead of A. The engines are at the front ends. The engine of train A blows a long whistle. Assume that the sound of the whistle is composed of components varying in frequency from ƒ1 = 800 Hz to ƒ2 = 1120 Hz, as shown in the figure. The spread in the frequency (highest frequency–lowest frequency) is thus 320 Hz. The speed of sound in still air is 340 m/s. The spread of frequency as observed by the passengers in train B is :–
Two trains A and B are moving with speed 20 m/s and 30 m/s respectively in the same direction on the same straight track, with B ahead of A. The engines are at the front ends. The engine of train A blows a long whistle. Assume that the sound of the whistle is composed of components varying in frequency from ƒ1 = 800 Hz to ƒ2 = 1120 Hz, as shown in the figure. The spread in the frequency (highest frequency–lowest frequency) is thus 320 Hz. The speed of sound in still air is 340 m/s. The spread of frequency as observed by the passengers in train B is :–
Physics-General
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A transverse sinusoidal wave moves along a string in the positive x–direction at a speed of 10 cm/s. The wavelength of the wave is 0.5 m and its amplitude is 10 cm. At a particular time t, the snap–shot of the wave is shown in figure. The velocity of point P when its displacement is 5 cm is :–
A transverse sinusoidal wave moves along a string in the positive x–direction at a speed of 10 cm/s. The wavelength of the wave is 0.5 m and its amplitude is 10 cm. At a particular time t, the snap–shot of the wave is shown in figure. The velocity of point P when its displacement is 5 cm is :–
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A massless rod BD is suspended by two identical massless strings AB and CD of equal lengths. A block of mass m is suspended at point P such that BP is equal to x, if the fundamental frequency of the left wire is twice the fundamental frequency of right wire, then the value of x is :
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