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The diagram shows a print P on a string at a particular instant of time. A transverse wave is travelling along the string from left to right.

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Which is correct about the direction and the magnitude of the velocity of point P at this instant?

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Important Questions on Waves

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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 2
A tight rope with one end tied to a vertical wall is shaken with frequency f so that a travelling wave of wavelength λ Is created on the rope. The rope is now shaken with the frequency 2f.  Which gives the new wavelength and speed of the wave respectively?
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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 3

The graph shows the displacement of a medium when a longitudinal wave travels through the medium from left to right. Positive displacements correspond to motion to the right. Which point corresponds to the centre of the compression?

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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 4
The diagram shows wavefronts of a wave entering a medium in which the wave speed decrease. Which diagram is correct?
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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 5

The graph shows the variation with the time of the displacement of a particle in a medium when a wave of intensity I travel through the medium. The Intensity of the wave is halved. Which graph now represents the variation of displacement with time? (The scale on all graphs is the same.)

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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 6
Which of the following does not apply to longitudinal waves?
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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 7
Interference is observed with two identical coherent sources. The intensity of the waves at a point of constructive interference is I. What is the intensity when one source is removed?
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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 8
Unpolarized light of the intensity I0 is incident on two polarisers, one behind the others, with parallel transmission axes. The first polarizer is rotated by 30° clockwise and the second 30°counter-clockwise. What is the intensity transmitted?
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Physics for the IB Diploma 6th Edition>Chapter 4 - Waves>Exam-style questions>Q 9
A pipe of length 8.0 m is open at one end and closed at the others. The speed of sound is 320 ms-1. Which is the lowest frequency of a standing wave that can be established within this pipe?