Doppler Effect and Speed of Light

Doppler Effect

​

Learning Outcomes

• State the Doppler Effect

• Be able draw the Doppler effect

• Give examples

• Explain in terms of frequency

Multiple Choice

What can you tell about this object's motion?

• Moving to the North (up).
• Moving to the South (down). 
• Moving to the West (left). 
• Moving to the East (right). 

Multiple Choice

What can you tell about the motion of this object?

• Moving left.
• Moving right quickly.
• Standing still. 
• Moving up slowly. 

Multiple Choice

The vast majority of galaxies in our universe are moving away from us.  We know this because we observe __________ in the galaxies absorption spectra.

• Redshift
• Blueshift
• Turbulance
• Superposition

Multiple Choice

If a star is being observed from Earth and it's light has shifted towards the blue side of the electromagnetic spectrum it would be...

• Moving towards the Earth
• Moving away from the Earth
• This is a trick question that cannot be answered
• It isn't a star, it is a very large blueberry.

Multiple Choice

What best describes the doppler effect?

• An apparent change in frequency of a wave due to the relative motion between a wave source and an observer
• When sound changes pitch
• When light changes color
• An apparent change in the amplitude of a wave due to the relative motion between a wave source and an observer.

Multiple Choice

The Doppler effect is seen when a wave-making source moves toward an observer. 

• True
• False

Multiple Choice

When an ambulance move TOWARD you it sounds ________ pitched. 

• high
• low
• medium

Multiple Choice

When the car moves AWAY from you, its horn seems...

• Low pitched
• High pitched
• Normal

Multiple Choice

Short sound waves are...

• high pitched
• low pitched
• medium pitched

Multiple Choice

Long sound waves are...

• high pitched
• low pitched
• medium pitched

Multiple Choice

Sound does not travel in space because

• Space is too far away.
• There is no matter in space.
• Space is the final frontier
• Space has planets.

Multiple Choice

Roughly what is the speed of sound in water?

• About 350 m/s

• About 1 500 m/s

• About 5000 m/s

• About 1800 m/s

Multiple Choice

Roughly what is the speed of sound in air?

• The speed of light.

• About 10 m/s

• About 340 m/s

• About 1 500 m/s

Multiple Choice

Why does sound travel faster in solids than in liquids or gases.

• They are harder.

• The particles are closer together.

• Solids have more energy.

• Gases fill their container.

Multiple Choice

Which state of matter do sounds travel fastest in?

• Solid

• Liquid

• Gas

• Plasma

Multiple Choice

Which factor does not affect the speed of sound:

• temperature
• distance
• density
• elasticity

Poll

How are you at stating the Doppler Effect

• Very confident

• Okay

• Not sure

• Not a clue

Poll

How are you at giving examples of the Doppler effect?

• Very confident

• Okay

• Not sure

• Not a clue

Poll

How are you at explaining frequencies?

• Very confident

• Okay

• Not sure

• Not a clue