jump start #1 1)a standing wave has areas that don’t leave the rest position. these are called. a...
TRANSCRIPT
Jump Start #11) A standing wave has areas that don’t leave the
rest position. These are called.A – NodesB – CrestsC – TroughsD – Compression
Jump Start #12) A transverse wave causes the medium to vibrate:
A – Parallel to the direction the wave movesB – At right angles to the direction the wave
travelsC – Only in one directionD - Randomly
Jump Start #13) A longitudinal wave does not have crests and
troughs like a transverse wave. A longitudinal wave has:
A – CompressionB – SurfaceC – RarefactionD – Both A and C
Jump Start #14) A transverse wave is traveling along a slinky on a
table. When that wave reaches the end of the slinky, which is being held still, the wave will:
A – Reflect back in the opposite directionB – Lose energy and disappearC – Change into a longitudinal waveD – Increase in amplitude
Jump Start #15)Label the parts of the wave below using the
following terms:
AmplitudeCrestWavelengthTrough
Jump Start #16) If a wave pulse on a slinky travels 10 meters in 2
seconds what is the speed of that wave? (speed = d/t)
A – 10 m/sB – 5 m/sC – 12 m/sD – 20 m/s
Waves
What comes to mind?
http://www.youtube.com/watch?v=Qf0t4qIVWF4&safety_mode=true&persist_safety_mode=1
Energy and Waves
Mechanical Wave – when a source of energy causes a vibration to travel through a medium.
What is a medium?
Air Vortex Canon
Parts of a Wave
• Medium• Crest• Trough• Compression• Rarefaction• Frequency• Period• Hertz
• Wavelength• Speed• Amplitude• Mechanical Wave• Transverse Wave• Surface Wave
Breaking Sound Barrier
• http://www.youtube.com/watch?v=7HbMcg-quwA
• http://www.grc.nasa.gov/WWW/K-12/airplane/sndwave.html
How Fast Can Waves Travel?
Speed of Light 299,792,458 meters/second186,000 miles per second 669,600,000 miles/hour
That’s nearly 7 and ½ times around the equator of the earth in 1 second.
Wave Speed
Speed = Wavelength X Frequency
What is Frequency?
The number of complete cycles in a given time.
Frequency is measured in cycles per second or hertz (Hz)
Making Waves
Use the string and a ruler to make waves with the following properties:
1) Wavelength = ½ meter
Making Waves
Use the string and a ruler to make waves with the following properties:
1) Wavelength of 10 centimeters
Making Waves
Use the string and a ruler to make waves with the following properties:
1) Amplitude of 20 centimeters
Making Waves
Use the string and a ruler to make waves with the following properties:
1) Amplitude of 5 centimeters