# Physics Flashcards - Periodic Motion, Waves

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1. What is the formula for Hooke's Law?

F =
F = -(spring constant)(displacement from equilibrium)

F= -kx
2. What are the formulas for angular frequencies of a mass on a spring and of a pendulum (SHM)?

ω =
ω =  (for springs)

ω =   (for pendulums)
3. What is the formula for kinetic energy (SHM)?

K =
K = 1/2(mass)(velocity)2 =
4. What is the formula for potential energy (SHM)?

U =
For springs:

U = 1/2(spring constant)(displacement)2 = 1/2kx2

For pendulums:

U = (mass)(gravity)(height) = mgh
5. (T/F) For an object in SHM, E = K + U = constant.
True.
6. When is an object's kinetic energy greatest (SHM)?
Kinetic energy is greatest at the equilibrium point.
7. When is an object's potential energy greatest (SHM)?
Potential energy is greatest at maximum displacement from equilibrium.
8. (T/F) For an object in SHM, frequency = 1/period.
True.
9. What are the formulas for the period of a mass on a spring and of a pendulum in SHM?

T =
For Springs:

For Pendulums:

10. Describe particle oscillation in a transverse wave.
Particles oscillate perpendicular to wave motion in a transverse wave.
11. Describe particle oscillation in a longitudinal wave.
Particles oscillate along the direction of wave motion in a longitudinal wave.
12. What is the formula relating the speed of a wave to its frequency (f) and wavelength (λ)?

v =
v = fλ
13. (T/F) A sinusoidal wave crosses its equilibrium point every 90°.
False, a sinusoidal wave crosses its equilibrium point every 180°.
14. (T/F) The fundamental harmonic has the longest wavelength and thus the smallest frequency of all the harmonics.
True.
15. (T/F) The higher the harmonic, the greater the wavelength.
False, the higher the harmonic, the shorter the wavelength.
16. What is a node?
A node is a point in a standing wave that remains at rest.
17. What is an anti-node?
An anti-node is a point in a standing wave that fluctuates at maximum amplitude.
18. Two waves that are 180° out of phase exhibit which type of interference?
Destructive interference.
19. Two waves that are 720° out of phase exhibit which type of interference?
Constructive interference.
20. (T/F) When two waves are out of phase by 180° and interfere with each other, the resulting displacement is always zero.
False, the resultant displacement is only zero when the two waves have equal amplitude.
21. What is the formula for sound intensity?

I =
22. What is the beat frequency for two frequencies which differ by 4 Hz?
4 Hz.

This is a trick question - the beat frequency is equal to the difference of the two frequencies.
23. (T/F) The observed frequency from a source emitting a sound is higher if the source is moving toward a stationary observer.
True.
24. (T/F) Standing waves in pipes open at both ends have nodes at the ends of the pipes.
False, standing waves in pipes open at both ends have antinodes at the ends of the pipe.
25. (T/F) Standing waves in strings fixed at both ends have nodes at the ends of the strings.
True.
26. (T/F) Higher harmonics of standing waves in open pipes have higher wave speed than lower harmonics.
False, the wave speed of all harmonics is the same.
27. Which harmonic does the following represent?

1st Harmonic
28. Which harmonic does the following represent?

1st Harmonic.
29. Which harmonic does the following represent?

2nd Harmonic.
30. Which harmonic does the following represent?

3rd Harmonic.
 Author: awc1990 ID: 212596 Card Set: Physics Flashcards - Periodic Motion, Waves Updated: 2013-04-10 06:08:43 Tags: Physics Flashcards Periodic Motion Waves Folders: Description: Physics Flashcards - Periodic Motion, Waves Kaplan MCAT P48-P55 Show Answers: