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question_answer1) The rope shown at an instant is carrying a wave travelling towards right, created by a source vibrating at a frequency\[n\]. Consider the following statements I. The speed of the wave is \[4n\times ab\] II. The medium at \[a\] will be in the same phase as \[d\]after \[\frac{4}{3n}s\] III. The phase difference between \[b\] and \[e\] is \[\frac{3\pi }{2}\] Which of these statements are correct [AMU 2001]
question_answer2) Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be [IIT-JEE (Screening) 2001]
question_answer3) A man is standing on a railway platform listening to the whistle of an engine that passes the man at constant speed without stopping. If the engine passes the man at time \[{{t}_{0}}\]. How does the frequency \[f\] of the whistle as heard by the man changes with time [AMU 2001; KCET 2002; MP PMT 2004]
question_answer4) The figure shows four progressive waves A, B, C, and D with their phases expressed with respect to the wave A. It can be concluded from the figure that [CPMT 1986, 88]
question_answer5) The diagram below shows the propagation of a wave. Which points are in same phase [AIIMS 1982]
question_answer6) Fig. below shows the wave \[y=A\sin (\omega t-kx)\] at any instant travelling in the +ve x-direction. What is the slope of the curve at B
question_answer7) Figure here shows an incident pulse P reflected from a rigid support. Which one of A, B, C, D represents the reflected pulse correctly
question_answer8) Which of the following curves represents correctly the oscillation given by \[y={{y}_{0}}\sin (\omega \,t-\varphi )\], where \[0<\varphi <90\]
question_answer9) The correct graph between the frequency n and square root of density (r) of a wire, keeping its length, radius and tension constant, is
question_answer10) A sound source emits sound waves in a uniform medium. If energy density is E and maximum speed of the particles of the medium is \[{{v}_{\max }}.\]The plot between E and \[{{v}_{\max }}\] is best represented by
question_answer11) If the speed of the wave shown in the figure is 330m/s in the given medium, then the equation of the wave propagating in the positive x-direction will be (all quantities are in M.K.S. units)
question_answer12) Two pulses travel in mutually opposite directions in a string with a speed of 2.5 cm/s as shown in the figure. Initially the pulses are 10cm apart. What will be the state of the string after two seconds
question_answer13) Two tuning forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these are vibrated together and the beats produced are represented by the line OB. If the frequency of P is 341Hz, the frequency of Q will be
question_answer14) An observer starts moving with uniform acceleration a toward a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency, heard by the observer varies with time as
question_answer15) A wave is travelling along a string. At an instant, shape of the string is as shown in fig. At this instant, point A is moving upwards. Which of the following statements is/are correct
question_answer16) The displacement-time graphs for two sound waves A and B are shown in the figure, then the ratio of their intensities \[{{I}_{A}}/{{I}_{B}}\] is equal to
question_answer17) A wave motion has the function \[y={{a}_{0}}\sin (\omega \,t-kx)\]. The graph in figure shows how the displacement y at a fixed point varies with time t. Which one of the labelled points shows a displacement equal to that at the position \[x=\frac{\pi }{2k}\] at time t = 0
question_answer18) The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right Which one of the following correctly shows the direction of the velocity of the points 1, 2 and 3 on the string
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