# Physics - periodic motion, sound, waves

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 Author: misbah ID: 220531 Filename: Physics - periodic motion, sound, waves Updated: 2013-05-21 12:22:07 Tags: springs pendulums shm Folders: Description: .. Show Answers:

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1. Frequency

units: Hz = 1/s
2. Angular frequency

3. Hooke's law
Restoring force of a spring

• k = spring constant
• x = displacement
4. Angular frequency of a spring
• oscillations/s
5. potential energy of a spring
6. kinetic energy of a spring
7. Restoring force of a pendulum

θ= angle between pendulum arm and vertical
8. Angular frequency of a pendulum

L= length of arm
9. Potential energy of a pendulum

• h = height difference from equilibrium
• At maximum displacement, potential energy is maximum
10. Speed of a wave
v = fλ

for light: c = fλ

c= 3 x 108

λ = wavelength
11. Length of pipe open at both ends
• n= harmonic
12. Length of pipe closed at one end
13. Intensity of sound
• intensity is the average rate per unit area that energy is transferred across a perpendicular surface by the wave.
• P = power
• A = amplitude
14. Sound level

I= lowest intensity of hearing
15. BEat frequency
16. Doppler effect

• vd = velocity of detector. Negative If source stops and detector is moving away.
• vs =velocity of source. Negative if detector stops and source is moving towards.
• v = speed of sound in air
• f' = perceived frequency
• f = actual frequency

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