Chapter2-Unit C
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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| sound | a wave that travels through matter, produced by a vibrating object
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| ultrasound | sound waves in the range above 20,000 hertz
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| amplification | the increasing of the strength of an electrical signal
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| vibration | a rapid, back and forth motion
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| decibel | the unit that measures sound intensity
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| resonance | the strengthening of a sound wave when it combines with an object's natural vibration
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| acoustics | the scientific study of sound
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| vacuum | an empty space with no or very few particles
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| Doppler effect | the change in observed pitch that occurs when the source or the receiver of a sound is moving
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| echolocation | sending out ultrasound waves and interpreting the returning sound
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| pitch | the quality of the highness or lowness of a sound
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| intensity | the amount of energy in a sound wave
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| sonar | instruments that use echolation to location objects
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| hertz | one complete wavelength per second, or the unit for measuring frequency
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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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