Outer Space Review

Why can't sound exist in outer space?

• There is no medium to travel through

• The layers of the atmosphere block it

• There is no gravity to vibrate the air

• There is no atmosphere to amplify the sound

What is the relationship between frequency and wavelength?

• Inverse - wavelength increases, frequency decreases

• Direct -

  Wavelength increases, frequency increases

• Longitudinal - waves stretch side to side

• Proportional - wavelength and frequency increase together

What is the Doppler Effect?

• The phenomenon of sound waves bouncing off of objects

• The phenomenon of light waves being bent when passing through a medium

• Apparent change in frequency and wavelength of an energy source due to its motion

• The phenomenon of sound waves being amplified when passing through a medium

As an ambulance moves toward you, what happens to its pitch?

• Pitch is lower because wavelength is increasing and frequency is decreasing

• Pitch remains the same because wavelength and frequency are not changing

• Pitch is higher because wavelength is decreasing and frequency is increasing

What is a red shift?

• When light moves away

• When an object moves closer

• When an object changes color

What is a blue shift?

• Light is moving closing

• A decrease in the speed of sound

• A decrease in the frequency of sound

If an ambulance is moving away from you its wavelength will ​ (a)   and its frequency (pitch) will get ​ (b)  

• longer
• lower
• shorter
• higher

What is the Doppler Effect?

• The phenomenon of sound waves bouncing off objects

• The phenomenon of light waves being bent by gravity

• Apparent change in frequency and wavelength of an energy source due to relative motion

• The phenomenon of sound waves being refracted by a medium

If an object is moving toward us, this causes a ​ (a)   shift.

• blue
• red

If an object is moving away from us, this causes a ​ (a)   ​ shift.​

• red
• blue