Vocabulry
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Decibel | Logarithmic unit used to express the ratio between two values of a physical quantity, often power or intensity.
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| Compression | Reduction in the number of bits needed to represent data.
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| Rarefaction | Diminution in the density of something, especially air or a gas.
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| Doppler Effect | The change in frequency of a wave.
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| Vacuum | A space entirely devoid of matter.
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| Frequency | Rate at which a vibration occurs that constitutes a wave, either in a material.
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| Hertz | Unit of frequency, equal to one cycle per second.
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| Ultrasonic | Involving sound waves with a frequency above the upper limit of human hearing.
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| Infrasonic | Denoting sound waves with a frequency below the lower limit of human audibility.
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| Echo | A sound or series of sounds caused by the reflection of sound waves from a surface back to the listener.
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| Interference | The combination of two or more electromagnetic wave forms to form a resultant wave in which the displacement is either reinforced or canceled.
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| Reverberation | Prolongation of a sound; resonance.
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| Pitch | The quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone.
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| Rhythm | A strong, regular, repeated pattern of movement or sound.
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| Oscilloscope | A device for viewing oscillations, as of electrical voltage or current, by a display on the screen of a cathode ray tube.
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| Wavelength | The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
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| Crest | A comb or tuft of feathers, fur, or skin on the head of a bird or other animal.
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| Trough | A long, narrow, open container for growing plants or mixing chemicals.
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| Kilohertz | A measure of frequency equivalent to 1,000 cycles per second.
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| Megahertz | One million hertz, especially as a measure of the frequency of radio transmissions or the clock speed of a computer.
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| Echolocation | The location of objects by reflected sound, in particular that used by animals such as dolphins and bats.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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