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| ____________waves are produced by the vibrations of material objects. |
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| Sound waves consist of traveling pulses of high-pressure zones or ______________, alternating with pulses of low-pressure zones or ______________________________________. |
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| Sound can/can not travel through a vacuum. |
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| Sound travels fastest through very __________ materials, such as steel. |
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| Every object vibrates at its own set of natural __________________. |
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| When a sounding board is forced to vibrate by a sound source, the sound becomes ____________________. |
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| When an object is forced to vibrate at one of its natural frequencies, resonance occurs and the sound becomes ____ _______. |
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| Two sound waves can exhibit interference and make sound ___________ or _______________________. |
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| ________occur when two tones very close in frequency are heard at the same time. |
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| A subjective impression about the frequency of sound is called _________. |
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| Ultrasonic waves have frequencies _______________ 20,000 Hz. |
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| Infrasonic sound waves have frequencies ___________ 20 Hz. |
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| We can/ can not hear infrasonic and ultrasonic frequencies. |
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| In sound, a pulse of compressed air is called __________________. |
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| A disturbance in air in which the pressure is lowered is called a _____________________. |
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| The transmission of sound does/ does not require a medium. |
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| Rapid changes in loudness are known as ______________________. |
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| The vibration of an object that is made to vibrate by another vibrating object that is nearby is called _________________________. |
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| A frequency at which minimum energy is required to produce forced vibrations. |
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| When the frequency of a forced vibration matches the object’s natural frequency a dramatic increase in amplitude occurs. This phenomenon is called _______________. |
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| To determine the # of beats heard between two frequencies. Subtract the frequencies. What is the beat frequency when 262 Hz and 266 Hz tuning forks sound together? |
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| What is the beat frequency when a262 Hz and a 272 Hz tuning fork are sounded together? |
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