Physics Chapter 26 Word Scramble

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Question	Answer
Sound wave are produced by what?	the vibrations of material objects.
A disturbance in the form of a longitudinal wave travels away from the vibrating souce.	correct
High-pitched sounds ae produced by sources vibrating at high frequency, while low-pitched sounds are reproduced by low frequency sources.	correct.
Sound waves constist of what?	traveling pulses of high pressure zones, or compressions, altenating wth pulses of low-pressure zones, or rarefactions.
Sound can travel through:	gases, liquids, and solids
Soun cannot travel through:	a vacuum.
Sound travels fastest through:	very elastic materials, such as steel.
Every object vibrates at its own set of natural frequencies.	correct.
When an object such as a sounding board is forced to vibrate by a sound source, the sound becomes louder.	correct.
When an object is forced to vibrate at one of its own natural frequencies, resonance occurs and the sound becomes much louder.	correct.
Like any waves, two sound waves can exhibit interference and make sound louder and softer.	correct.
Rapid changes in loudness, known as beats, occur wen two tones very close in frequency are heard at the same time.	correct.
All sounds are produced by:	the vibrations of material objects.
How does sound work?	The orginal vibration stimulates the vibation of something larger or more massive. This vibrating material then sends a disturbance through a surrounding medium, usually air, in the form of longitudinal waves. oridnary conditions: source Hz=soundwave Hz
For all wave motion, it is not the medium that travels across the room, but	a PULSE that travels.
Do solids and liquids conduct better or worse than air?	Better. Sound travels faster in liquids than in gases, and faster in solids.
SOUND CANNOT TRAVEL IN A VACUUM. Why?	If there's nothing to compress and expand, there can be no sound. There may be vibrations, however.
Sound is much slower than light.	correct.
The speed of sound in a material depends on the material's elasticity, which is the ability of a material to change shape in repsonse to an applied force, and the resume its initial shape once the distorting force is removed.	correct.
Sound travels about 15 times faster in steel than in air, and about four time faster in water than in air.	correct.
The intensity of sound is proportional to the square of the amplitude of a sound wave.	correct.
The unit of intesity for sound is the decibel (dB), after Alexander Graham Bell(inventor of the telephone.)	correct
A natural frequency is one at which minimum energy is required to produce forced vibrations. It is also the frequency that requires the least amountof enery to continue this vibration.	correct
Natural frequency depends on what?	elasticity and shape of the object
What is resonance?	WHen the frequency of a forced vibratio on an object matches the object's natual frequency, a dramatic increase in amplitude occurs. This phenomenon is called resonance.
What does something need to resonate?	It needs a force to pull it back to its starting position and enough energy to keep it vibrating.
For sound, the crest of a wave correponds to a compression, and the trough of a wave corresponds to a rarefaction.	correct
The periodic vartion in the loudness of sound is called	beats.

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