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CPS Lesson: Oscillations and Waves Answer Key, Study notes of Law

Royal Military AcademyLaw

An answer key for a CPS lesson on oscillations and waves. It includes multiple-choice questions covering topics such as equilibrium points, oscillation requirements, velocity and acceleration, frequency changes, and wave interference. Useful for students studying physics.

Typology: Study notes

2021/2022

Uploaded on 08/05/2022

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CPS lesson
Oscillations and Waves
ANSWER KEY
1.
An object can oscillate around:
A. any equilibrium point
* B. any stable equilibrium point
C. certain stable equilibrium points
D. any point
2.
Which of the following is necessary for an object to oscillate?
A. stable equilibrium
B. small or no friction
C. a disturbance
* D. all of the above
3. At point P the object has:
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18

Partial preview of the text

Download CPS Lesson: Oscillations and Waves Answer Key and more Study notes Law in PDF only on Docsity!

CPS lesson

Oscillations and Waves

ANSWER KEY

An object can oscillate around: A. any equilibrium point

  • B. any stable equilibrium point C. certain stable equilibrium points D. any point

Which of the following is necessary for an object to oscillate? A. stable equilibrium B. small or no friction C. a disturbance

  • D. all of the above
  1. At point P the object has:

A. positive velocity and positive acceleration

  • B. positive velocity and negative acceleration C. negative velocity and positive acceleration D. negative velocity and negative acceleration E. positive velocity and zero acceleration
  1. A mass is oscillating on a spring. Consider two possibilities: (i) at some point the velocity is zero but the acceleration is nonzero (ii) at some point both the velocity and acceleration are zero

A. both occur

C. decreases

  1. The traces below show beats when two different pairs of waves are added. For which pair is the difference in frequency of the added waves larger?
  • A. pair 1 B. pair 2 C. same for both D. need more info
  1. The traces below show beats when two different pairs of waves are added. Which of the two pairs originally contains a wave with the highest frequency?

A. pair 1

  • B. pair 2 C. both the same D. need more info

The disk rotates at 29 rev/sec and is filmed with a camera taking 30 frames/sec. The dot on the film appears to:

A. slowly rotate clockwise

  • B. slowly rotate counter-clockwise C. rapidly rotate clockwise D. rapidly rotate counter-clockwise E. jump around randomly
  1. A pulse moves with uniform speed v on a rope. Which shows the displacement vs time of P?

A.

* B.

C.

D.

What changes when the wave crosses the connection point?^ 13. A thick and thin string are connected end-to-end. A wave travels along it. A. frequency B. period C. wave speed

  • D. exactly two of the above E. all three of the above

A traveling pulse on a string carries: A. energy

B. momentum

  • C. both energy and momentum D. neither energy nor momentum
  1. Two joined strings are made of the same material but the first has 4 times the diameter of the second. What is the ratio of the speeds v1/v2 of a pulse traveling from one to the other?

A. 1

B. 1/

* C. 1/

D. 1/

  1. Two pulses of equal and opposite maximal displacement cross each other. Which of the following statements is true in the region of the overlapping pulses? A. There is an instant at which the string is straight. B. There is an instant at which the energy is zero.

D. some points are zero, some upward, some downward

A simple harmonic oscillator has a position given by 15cos(6t+9) in appropriate units.The angular frequency is:

A. 15

  • B. 6 C. 9 D. 12p

If it takes 6 seconds for the bob to get from A to B, the period of the pendulum is:

A. 3 s B. 6 s

  • C. 12 s

D. 12p s

Hooke's law states that the restoring force is always opposite in direction to the object'sdisplacement.

  • A. True B. False

A pendulum only exhibits simple harmonic motion for small angular displacements.

True *^ A. B. False

Which is the best plot of overdamping?

Which figure represents a source moving at less than mach 1? A.

* B.

C.

Three people at 1, 2, and 3 are listening to a sound wave emitted by a moving source.

Which of the following statements is true?

A. the wavefronts move fastest at 1 B. the wavefronts move fastest at 3 C. the frequency is highest at 1 D. the frequency is highest at 2

  • E. the frequency is highest at 3

An airplane is flying past a person at greater than mach 1. The person hears:

  1. You shake the end of a slinky back and forth. It reflects perfectly off the far end which is clamped. The interference between the original and the reflected wavegives:

A. complete cancellation B. a standing wave with the original amplitude

  • C. a standing wave with twice the amplitude D. a traveling wave with twice the amplitude
  1. A tuning fork is struck and swung in a circle at the end of a string. As the tuning fork approaches you, the frequency heard is higher because: A. it is vibrating in a higher energy mode
  • B. the wavefronts are closer together C. the speed of sound is increased D. the tuning fork is getting louder as it approaches

A 1-m pendulum bob on a string has a period of about 2 s. At what frequencies can the bob be tapped to excite resonances? A. 1 Hz B. 0.5 Hz C. 0.25 Hz D. 0.5 and 1 Hz

  • E. 0.25 and 0.5 Hz

Which of the following statements is false? A. Electromagnetic radiation is a wave.

  • B. All waves are sinusoidal. C. In a transverse wave, the particles move perpendicular to the direction of the wave. D. In a longitudinal wave, the particles move parallel to the direction of the wave.

A wavefunction is given by 49sin(81x-36t+5) in appropriate units. The amplitude of this33. wave is:

  • A. 49 B. 81 C. 36 D. - E. 5

The period of the graphed wave in SI units is:

A.

B.

* C.

If you want to increase the speed of a pulse on a rope, you should tighten up the rope.

True *^ A. B. False

Sound waves in a fluid are not: A. longitudinal

  • B. transverse C. pressure oscillations D. displacement oscillations

There is no Doppler effect for waves other than sound. A. True

  • B. False

Which of the following statements is true?40. A. You only get a Doppler effect if the source and observer are moving relative to each other. B. If the source and observer are getting closer to one another, the observed frequency increases. C. The wave speed does not affect the Doppler shift.

  • D. More than one statement is true.

Is there a wave speed associated with a standing wave? A. No

  • B. Yes