AbiKrafft Chapt 26
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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| Pitch | Term that refers to how high or low sound frequencies appear to be.
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| Infrasonic | Term applied to sound pitch too high to be heard by the human ear, that is, below 20 hertz.
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| Ultrasonic | Term applied to sound frequencies above 20,000 hertz, the normal upper limit of human hearing.
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| Compression | In sound, a pulse of compressed air (or other matter); opposite of rarefaction.
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| Rarefaction | A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression.
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| Natural Frequency | A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency.
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| Forced Vibration | The vibration of an object that is made to vibrate by another vibrating object that is nearby. The sounding board in a musical instrument amplifies the sound through forced vibration.
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| Resonance | A phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude results.
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| Beats | A periodic variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together.
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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.
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.
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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Created by:
akrafft
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