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30 Cards in this Set
- Front
- Back
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What does a longitudinal wave look like and what is an example |
1. -----------------> 2. Sound wave |
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What does a tranverse wave look like, and what is an example? |
1. ~~~~~~~~~~~ 2. Wave on a string |
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Particles that bump side to side mean the wave is? |
Longitudinal |
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Particles that move perpendicular to the transfer of energy belong to which wave? |
Transverse |
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What is a surface wave? Give an example |
Mix of longitudinal and transverse waves, like water in the ocean |
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What is a cycle? |
One complete back and forth motion. |
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What is frequency and what is its measurements? |
It is the number of cycles per unit time, measured in Hertz (Hz) |
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What is displacement? |
Distance an object moves from teh equilibrium |
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What is amplitude? |
The maximum distance from the equilibrium to either the trough or peak. |
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If a force of tension on a string is greated than the force of gravity what happens? |
The mass moves upwards. |
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If the force of gravity is greater than the force of tension, what happens? |
Mass moves downward |
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What is the doppler effect? |
When a source of sound approaches an observer, the sound increases. When the source moves away the sound decreases. |
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What is damping? |
A reduction in amplitude of a wave due to energy absorbtion |
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What does refraction have to do with sound and temperature? |
Sound is dependant on temperature. Sound travels faster when it is warm. |
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In the doppler effect equation, if the observer is moving towards the source of the sound is it positive or negative? |
positive |
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In the doppler effect equation, if the source of the sound if moving towards the observer is it positive or negative? |
negative |
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Higher pitch = higher _________ = __________ wave length |
1. frequency 2. Shorter |
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The bigger the amplitude the ___________ the sound |
louder |
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What is mechanical resonance? |
The transfer of energy from one object to another, this causes large amplitude vibrations when the second object has the same resonant frequency. |
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Sympathetic frequency is... |
The response to a vibration with the same resonant frequency |
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Aeroelastic flutter is... |
the response when energy added to a structure vibrating the air, exceeds energy lost due to damping. |
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The tendency for something to vibrate at their natural frequency is called? |
Resonance |
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What are two types of resonance? |
Mechanical and accoustical |
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What is echolocation? And what animals use this? |
Location of objects through the analysis of ehoes and reflected sound. Dolphins, sperm whales, bats and orcas |
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What happens in a reflection at a fixed end? |
The reflection is inverted. |
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What is resonance? |
When frequency waves and the resonant frequency wave's medium are equal |
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What is the threshold of hearing? |
1 x 10^-12 |
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Superpositioning means you... |
Add the amplitudes together |
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Destructive means you... |
Subtract the amplitudes |
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Sound intensity means: |
amount of sound energy being transferred per unit area. |
