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27 Cards in this Set
- Front
- Back
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what is amplitude?
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amplitude is the maximum height reached by a wave from it's equilibrium point measured in db.
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When amplitude increases what happens to the sound? What happens when it decrease?
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Increase: louder
decrease: quieter |
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what happens to the light when amplitude in a n EM wave increases? Decreases?
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increase: brighter
decrease: Less bright |
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What is the decibel scale used for?
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To measure the power of sound.
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what kind of a scale is it?
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logarithmic scale, adding 3db doubles the sound level ex: 83 is 2x louder than 80db which is 2x louder than 77db
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What is frequency?
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It's the number of deformations (or cycles) produced per unit of time, usually per second. measure in Hertz (hz)
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What happens to the sound in the frequency increase? Decreases?
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Increase: higher pitch
Decrease: lower pitch |
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What happens when frequency in a light wave increases? Decreases?
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increase: more energy
decrease: less energy |
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What is a wavelength ?
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It's the distance between two identical deformations. Measured in nanometers (nm) or meters or (cm)...
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What is the dangerous level in decibel scale that can cause irreparable damage to the ear ?
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Prolonged exposure to a level above 80db.
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Name (in order) the waves on the EM spectrum.
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1. Radio waves 2.microwaves 3.infrared rays 4.visible light 5.Ultraviolet rays 6.x-rays 7. gamma rays
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what is some of the functions of radio waves ?
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less frequency but high wave length and is transmitted with antennas. Use: Radio and T.V
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What is some of the functions of microwaves?
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Satellite transmission in cellphones, internet and used for microwave ovens
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What is some of the functions of infrared rays?
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To put off head, you can't see it but you can feel it. ex: incubators.
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What is the function of visible light?
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provides plants with the energy they need for photosynthesis,l can be transformed---> electricity
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what is the function of ultraviolet rays ?
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black lights, sunburn, tanning...
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What is the function of x-rays?
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x-rays
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What is the function of gammarays?
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they can cause genetic mutation, cancer, but when used properly destroy cancerous cells in radiation therapy.
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what is the focal point of a lens ?
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the focal point of a lens is when the rays converge toward a precise point in the axis of the lens
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what is a concave lens associated with ?
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diverging lens
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What is a conve lens associated with ?
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A converging lens
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What is Myopia ?
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Not being able to see from far.
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What causes myopia?
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caused by a slightly elongated eyeball or an overly curved lens.
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How can Myopia be treated?
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This can be corrected with a concave lens.
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What is hyperopia ?
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Only seing clearly from a distance.
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What causes hyperopia?
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A slythly shortened eyeball or not enough of a curved lens.
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How can hyperopia be treated?
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With a biconvex lens.
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