Origin of Sound
All sounds are produced by _________ of material objects
What are vibrations?
Clap your hands and you produce a __________________ that goes out in all directions.
What is pulse?
Most of the sounds you hear are transmitted through the ______.
What is air?
The speed of sound differs in ____________ materials.
What is different?
The intensity of a sound is _______________ to the square of the amplitude of a sound wave.
What is proportional?
Your voice results from the vibration of your _______________________.
What are vocal chords?
When you clap your hands each particle moves back and forth along the _________________ of motion of the expanding wave
What is direction?
Solids and liquids are generally good _____________ of sound – much better than air.
What are conductors?
Sound is much _________ than light
What is slower?
The unit of intensity for sound is the _________________
What is decibel (dB)?
We describe our subjective impression about the frequency of sound by the word __________________.
What is pitch?
Consider the long room. At one end is an open window with a curtain over it. At the other end is the door. When you quickly open the door, a pulse of compressed air has moved from the door to the curtain.
This pulse of compressed air is called a ___________
What is compression?
In general, sound is transmitted faster in liquids than in gases, and still faster in _________.
For each degree increase in air temperature above 0°C, the speed of sound in air increases by _________ m/s.
What is 0.60?
Despite subjective variations, loudness varies nearly as the ________________ of intensity (powers of ten).
What is logarithm?
As we grow older, our hearing range shrinks, especially at the ___________________________ end.
What is high-frequency?
For all wave motion, it is not the medium that travels across the room, but a __________ that travels.
What is pulse?
Sound cannot travel in a vacuum. The transmission of sound requires a ____________.
What is medium?
The speed of sound in a material depends not on the material’s density, but on its _____________.
What is elasticity?
A sound of 10 dB is ______ times as intense as sound of 0 dB; 20 dB is not twice but 10 times as intense as 10 dB, or 100 times as intense as the threshold of hearing.
What is 10?
The audible range that we can hear is between ____ Hz and ______________ Hz
What is 20 and 20000?
The vibrations of the tuning fork and the waves it produces are considerably higher in ________________ and lower in _______________ than in the case of the swinging door.
What is frequency and amplitude?
If there is nothing to ____________ and ___________, there is no sound.
What is compress and extend?
Sound travels about ____________ times faster in steel than in air, and about ________ times faster in water than air.
What is 15 and 4?
A 60 dB sound is _________ times as intense as a 40 dB sound.
What is 100?