11.5. Sound http://www.ck12.org
MEDIA
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URL: http://www.ck12.org/flx/render/embeddedobject/302Simulation
Sound (PhET Simulation)Explore More
- Describe how sound is produce in a speaker, travels to your ear and how your ear converts these sound waves
into sound in your brain. - The Indian instrument called a “sitar” uses two sets of strings, one above the other. Only one set of strings
is played but both make sound. Research the sitar and explain briefly how this works. For more information
about the Sitar, see http://search.creativecommons.org/?q=sitar&sourceid=Mozilla-search. - A train, moving at some speed lower than the speed of sound, is equipped with a gun. The gun shoots a bullet
forward at precisely the speed of sound, relative to the train. An observer watches some distance down the
tracks, with the bullet headed towards him. Will the observer hear the sound of the bullet being fired before
being struck by the bullet? Explain. - The speed of soundvin air is approximately 331. 4 m/s+ 0. 6 T, whereTis the temperature of the air in
Celsius. The speed of lightcis 300,000 km/sec, which means it travels from one place to another on Earth
more or less instantaneously. Let’s say on a cool night (air temperature 10◦Celsius) you see lightning flash
and then hear the thunder rumble five seconds later. How far away (in km) did the lightning strike?
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