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| a longitudinal wave that is caused by vibrations and that travels through a material medium. |
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| a measure of how high or low a sound is perceived to be depending on the frequency of the sound wave. |
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| slow vibrations of frequencies lower than 20 Hz. |
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| any sound wave with frequencies higher than 20,000 Hz. |
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| a phenomenon that occurs when two objects naturally vibrate at the same frequency. |
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| a system that uses acusic signals and echo returns to determine the location of objects or to communicate. |
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| a unit or quantum of light. |
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| the rate at which energy flows through a given area of space. |
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| a system that uses reflected radio waves to determine the velocity and location of an object. |
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| a line in space that matches the direction of the flow of radiant energy. |
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| an image of an object forms at a location from which light rays appear to come but do not actually come |
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Definition
| an image of an object formed by light rays that actually come together at a specific location |
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Term
| total internal reflection |
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Definition
| the complete reflection that takes places whitin a substance when the angle of incidence of light striking the surface boundray is less than the critical angle. |
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Definition
| a transparent object that refracts light waves such that they converge or diverge to create an image |
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| a change in the size of an image compared with the size of an object |
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| in optics, a system that consists of two or more plane surfaces of a transparent solid at an angle with each other |
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Definition
| in optics, the process of separating a wave of different frequencies into its individual component waves |
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Definition
| The units that measure relative intensity aka dB |
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Definition
| This is found by comparing the intensity of a sound with the intensity of of the quietest sound a person can hear, the threshold of hearing. |
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