Key Ideas

1
Key Ideas

• I will be able to describe the relationship
  between the frequency and wavelength of a wave.
• I will understand why waves travel at different
  speeds.

2
Vocab Words

• Amplitude
• Wavelength
• Frequency

3
Page 9
What are the amplitudes (in meters) of the waves
below?

• Amplitude A measure of how high crests are the
  greater the amplitude, the more energy a wave
  carries.

.75 m
1 m
4

• Wavelength Distance from the top of one crest
  to the top of the next crest, or from the bottom
  of one trough to the bottom of the next trough.

5
1)Frequency is measured in Hertz 2) Speed divided
by distance. 3) Frequency related to the
wavelength

• Smaller wavelengths result in higher frequencies.
• Larger wavelength result in shorter frequency.

• Frequency Number of wavelengths passing a given
  point per second. Measured in hertz.
• - In other words, how many waves there are.

6
This wave has a high/low frequency
This wave has a high/low frequency
7
Wave Period
Wave period is just how much time it takes for
one cycle to pass and the units are always in
term of time. The faster a wave moves its
period becomes smaller
8

• Color and pitch result from the wavelengths and
  frequencies of light and sound.

Red Orange Yellow Green Blue Indigo
Violet
9

• Wave Speed how fast a wave travels through a
  medium.
• Mechanical waves travel faster in a medium in
  which atoms are packed closer together.
• Electromagnetic waves travel faster in a medium
  with fewer atoms in it.

Speed Wavelength Frequency
Wavelength Speed / Frequency
Frequency Speed / Wavelength
10
Labeled Waves
11
Whiteboard Time

• 1) Find the speed of a wave with a wavelength of
  5m and a frequency of 68 Hz.
• 2)Find the wavelength of a soundwave traveling in
  water with a speed of 1,470 m/s and a frequency
  of 2,340 Hz.
• 3) If Mr. Kelly does a cannonball and generates a
  wave that a wavelength of3.2m and a frequency
  of0.60 Hz, how fast is the wave moving?
• 4) An earthquake wave travels at 5000m/sec and
  has a wavelength of 417 m. What is its frequency?