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Name _____________________________

Date ___________________

Sound

Select the definition that most nearly defines the given word.
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1.   frequency    The pitch of a sound depends on the ____ of the sound wave.    The low point of a sound wave where the lowest air pressure occurs.    The part of the human body used for hearing.    A measure of the amount of energy that sound waves carry.

2.   vibrations    The pitch of a sound depends on the ____ of the sound wave.    A machine that converts an electrical signal into a sound wave with an increase in loudness.    The rapid back-and-forth movement of matter.    The area where particles or air are pushed closer together as a result of being near something that is vibrating.

3.   pitch    A large bang caused by an aircraft flying at or faster than the speed of sound.    The bending of waves as they pass through an opening or around the edge of an object.    A structure in humans that contains the vocal cords and vibrates to produce sounds.    A measure of the highness or lowness of a sound.

4.   hertz    A unit of frequency measured in cycles per second.    The bouncing back or change in direction of a wave after it strikes a barrier or an object. This may also be called an echo.    Two or more sound waves that overlap.    A machine that sends out sounds waves and uses the waves that are reflected back. This is used to help detect underwater objects.

5.   reflection    The distance between one crest or peak of a sound wave and the next crest or peak.    The bouncing back or change in direction of a wave after it strikes a barrier or an object. This may also be called an echo.    The unit used to express loudness.    The peak of a sound wave where the greatest air pressure occurs.

6.   loudness    A sound that is repeated because the sound wave reflected or bounced back from a distant object.    A measure of the amount of energy that sound waves carry.    The form in which sound energy moves from one place to another.    A unit of frequency measured in cycles per second.

7.   sonic boom    The rapid back-and-forth movement of matter.    A large bang caused by an aircraft flying at or faster than the speed of sound.    The loudness of a sound depends on the ____ of the sound wave.    The process of using reflected sound waves to find objects. Bats, dolphins, and some other animals use this to find food and avoid danger.

8.   diffraction    A form of energy that travels as waves through the air and some solids and liquids.    A measure of the highness or lowness of a sound.    The bending of waves as they pass through an opening or around the edge of an object.    The part of the human body used for hearing.

9.   echo    A sound that is repeated because the sound wave reflected or bounced back from a distant object.    The pitch of a sound depends on the ____ of the sound wave.    A machine that sends out sounds waves and uses the waves that are reflected back. This is used to help detect underwater objects.    A structure in humans that contains the vocal cords and vibrates to produce sounds.

10.   amplifier    The loudness of a sound depends on the ____ of the sound wave.    A unit of frequency measured in cycles per second.    A machine that converts an electrical signal into a sound wave with an increase in loudness.    The bouncing back or change in direction of a wave after it strikes a barrier or an object. This may also be called an echo.

11.   interference    A large bang caused by an aircraft flying at or faster than the speed of sound.    Two or more sound waves that overlap.    The form in which sound energy moves from one place to another.    The bending of waves as they pass through an opening or around the edge of an object.

12.   amplitude    The loudness of a sound depends on the ____ of the sound wave.    A form of energy that travels as waves through the air and some solids and liquids.    The area where particles or air are pushed closer together as a result of being near something that is vibrating.    The rapid back-and-forth movement of matter.