Vibrations, Waves and Sound (Doug G7 11 & 12 Conceptual)

If the frequency of an oscillating/vibrating object doubles, which of the following statements about that object are true?

• The amplitude of vibration doubled.

• The amplitude is reduced to one-half of what it was.

• The period of oscillation is doubled.

• The period is reduced to one-half of what it was.

• None of the above.

When a tuning fork is struck so that it oscillates with an amplitude A, it vibrates with a frequency f. If the tuning fork is now struck such that its amplitude is now doubled to 2A, what is the new frequency?

• 2f

• 4f

• f

• f/2

• f/4

The position-versus-time graph shown to the right depicts the motion of an oscillating object. Which one of the following graphs represents the velocity of this system as a function of time?

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• 
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The velocity-versus-time graph shown depicts the motion of an oscillating object. Which one of the following graphs represents the acceleration of this system as a function of time?

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• 
• 

The position-versus-time graph shown to the right depicts the motion of oscillating object. Which one of the following graphs represents the acceleration of this system as a function of time?

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What is the wavelength of the wave shown in the figure?

• 8 m.

• 4 m.

• 2 m.

• 1 m.

• It cannot be determined from the given information.

What is the frequency of the wave shown in the figure?

• 0.5 Hz.

• 1 Hz.

• 2 Hz.

• 4 Hz.

• It cannot be determined from the given information.

Which one of the curves shown in the figure best represents the variation of wave speed v as a function of tension for transverse waves on a stretched string?

• A

• B

• C

• D

• E

The intensity of the waves from a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?

• 4I

• 2I

• I/2

• I/4

• I/√2

The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the intensity equal to 2I?

• d/2

• d/√2

• d/4

• d/8