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christina r

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Coppell East

on 27 April 2010

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Transcript of christina r

While watching a distant thunderstorm, a student observes
that he hears the sound of thunder five seconds after he
sees its lighning. What is the best explanation for this observartion? A. Light waves travel faster through air through
a vacuum.

It's not this answer because...
Yes, light waves can travel in a vacuum, but there's still air, so the student isn't inside of a vacuum. B. Light waves travel only along a straight
path, but sound waves travel along a curved

It's not this answer because...
Although light travels in a straight line, and
sound can travel in a straight or curved line,
this doesn't have much of an effect on the
speed it travels. C. Light waves travel through air, but sound waves
must travel through air and water.

It's not this answer because...
They both travel through air and water. The student
isn't underwater though, so that doesn't have an effect on the speed. D. Light waves travel through air faster
than sound waves.

This is the correct answer because...
Light is an electromagnetic wave, so it doesn't
need a medium to travel, which explains why you
can see light in space. Sound needs a medium to
travel through, so you can't hear sound in space.
That's why light travels faster than sound.
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