Download The Speed of Sound and Doppler Effect

Name ______________________________________________ Date _________ Period ______
The Speed of Sound and Doppler Effect
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1.
Why do we see lightning before we hear thunder?
2.
Explain how pressure affects the speed of sound.
3.
In which situation does sound travel faster: (a) outside on a winter day, or (b) outside on a
summer day? Why?
4.
Does sound travel faster in steel or liquid water?
5.
What is the speed of sound if the air temperature is 35 °C?
6.
If a fire engine moves toward you, does the pitch of its siren increase or decrease?
7.
If you hear the pitch of an engine decrease, is the vehicle moving towards or away from
you?
8.
A paramedic in an ambulance does not experience the Doppler effect of the siren. Why?
9.
The Doppler Effect is used by astronomers to determine if stars are moving away from or
toward Earth. Red light has a lower frequency than blue light. If light from a star is
shifted to the red does that mean the star is moving toward or away from Earth?