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Do Now

Do Now.

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Do Now

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  1. Do Now • There was a big party at Lady Gaga’s mansion and everyone was there. During the party, Drake tripped on his shoelace and fell into the pool. Before he landed in the water, he let out a scream and kept screaming even after he went through the water. Do you think the sound of him screaming traveled faster before or after he landed in the pool?

  2. The frequency is… • The number of waves produced in a given amount of time • The UNIT of frequency is hertz(Hz) • One hertz = one wave per second (1 Hz = 1/s)

  3. If I made 15 waves in 3 seconds, what would my frequency be? (in Hz!)

  4. If I made 15 waves in 3 seconds, what would my frequency be? (in Hz!) • 5 Hz!

  5. If I made 15 waves in 3 seconds, what would my frequency be? (in Hz!) • 5 Hz! • If I made 35 waves in 10 seconds, what would my frequency be? (in Hz!)

  6. If I made 15 waves in 3 seconds, what would my frequency be? (in Hz!) • 5 Hz! • If I made 35 waves in 10 seconds, what would my frequency be? (in Hz!) • 3.5 Hz

  7. If I made 15 waves in 3 seconds, what would my frequency be? (in Hz!) • 5 Hz! • If I made 35 waves in 10 seconds, what would my frequency be? (in Hz!) • 3.5 Hz • If I made 62 waves in 1 second, what would my frequency be? (in Hz!)

  8. If I made 15 waves in 3 seconds, what would my frequency be? (in Hz!) • 5 Hz! • If I made 35 waves in 10 seconds, what would my frequency be? (in Hz!) • 3.5 Hz • If I made 62 waves in 1 second, what would my frequency be? (in Hz!) • 62 Hz

  9. Think of a number between 1-10… • Write that number on the upper right corner on your sheet protector • Copy this line onto your sheet protector Time in seconds 0 1 2 3 4 5

  10. Look at the number you wrote in the upper right corner • Try to draw this same number of full waves onto your line!

  11. Now calculate your frequency—REMEMBER, your formula will look like this: • # of waves / 5 seconds = _________ Hz • Write your answer on your sheet protector and circle it!

  12. Higher frequency means… • Shorter wavelength • More energy

  13. Lower frequency means… • _______ wavelength • _______ energy

  14. Lower frequency means… • LONGER wavelength • LESS energy

  15. What is the speed limit on this street? What is the speed limit on the highway?

  16. Waves have speeds too….

  17. The wave speed is… • The speed at which a wave travels

  18. Units for Waves • Wavelength  length (e.g. meter) • Amplitude  length (e.g. meter) • Frequency Hertz [number of waves per second (e.g. 1/s)] • Wave speed  length per time (e.g. meter/second)

  19. What affects wave speed? • The speed of a wave depends on the mediumthe wave is traveling through • For example, the wave speed of sound in AIR is about 340 m/s, BUT the wave speed of sound in STEEL is about 5,200 m/s

  20. Draw how you think the particles in a GAS (for example, smoke) look

  21. Draw how you think the particles in a GAS (for example, smoke) look

  22. Draw how you think the particles in a LIQUID (for example, Pepsi) look

  23. Draw how you think the particles in a LIQUID (for example, Pepsi) look

  24. Draw how you think the particles in a SOLID (for example, Pepsi) look

  25. Draw how you think the particles in a SOLID (for example, Pepsi) look

  26. Quick Activity

  27. Therefore… • Waves travel fastest in solids  liquids  gases

  28. Therefore… • Waves travel fastest in solids  liquids  gases • HOWEVER,the speed of a wave does NOT depend on the PROPERTIES (i.e. amplitude, frequency, wavelength) of waves!!!!

  29. So wave speed depends on… The medium NOT wave properties NOT amplitude NOT frequency NOT wavelength • Solid • Liquid • Gas

  30. Do Now • There was a big party at Lady Gaga’s mansion and everyone was there. During the party, Drake tripped on his shoelace and fell into the pool. Before he landed in the water, he let out a scream and kept screaming even after he went through the water. Do you think the sound of him screaming traveled faster before or after he landed in the pool?

  31. Exit Slip (Interactive Notebook) • What is the frequency of a wave and what is its unit? • TRUE or FALSE: Waves with lower frequency have longer wavelengths and less energy. • What is wave speed? • What affects wave speed? • Wave properties • The medium • Both wave properties and the medium • Neither wave properties or the medium

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