Warmup - Monday 16 th 1.In which kind of wave does the matter move perpendicular to the movement of the energy? a. longitudinal b. transverse 2. Which waves have troughs and crests? a. Longitudinal b. transverse 3.What happens to the wavelength as you increase the frequency of the wave? a. Gets Longer b. Gets Shorter
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Warmup- Monday 16th
1.In which kind of wave does the matter move perpendicular to the movement of the energy?
a. longitudinal b. transverse
2. Which waves have troughs and crests?
a. Longitudinal b. transverse
3.What happens to the wavelength as you increase the frequency of the wave?
a. Gets Longer b. Gets Shorter
Speed of Waves
Wave speed is equal to the frequency
of the wave times the wavelength.
Vw = f λ (units: meters/second, or
equivalent)
Look at that formula – if Vw stays the same.
What can you say about f and λ?
Practice Practice Practice
26/03/2015
1) A wave has frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?
Practice Practice Practice
26/03/2015
2) A wave has frequency of 5 Hz and a speed of 25 m/s. What is the wavelength of the wave?
26/03/2015
3) A flute is played and hits a note with a soundwave that is 512 Hz in frequency. The speed of the sound in the air is 342 m/sWhat is the length of the wave?
Brief SUMMARYA. All electromagnetic waves travel at the same
speed. (300,000,000 meters/second) in a vacuum.
B. They all have different wavelengths and different frequencies.– Long wavelength-lowest frequency– Short wavelength highest frequency– The higher the frequency the higher the energy.
TAKE OUT INTRO TO WAVES HANDOUTS FROM MONDAY
When Waves Hit ThingsReflection:
The wave bounces off the new medium and can
change direction
When Waves Hit ThingsReflection:
The wave bounces off the new medium and can
change direction
EXAMPLES?
ECHO
MIRROR
COLORS WE SEE
Refraction
Refraction:
The wave enters a new
medium and changes
speed
This is responsible for
“weirdness” when you
look at things through
water – magnification,
warping, etc…
Refraction
Refraction:
The wave enters a new medium and changes
speed
EXAMPLES?
Looking in a fish tank
Your voice sounds different to yourself than
when you hear it on a recording
Diffraction
Diffraction: The wave bends around
corners or edges of a barrier
Diffraction
Diffraction: The wave bends around corners
or edges of a barrier
EXAMPLES?
You see light from other room
You can hear someone from around a corner
TAKE 5 Minutes:Label the parts and match the definitions of a Transverse wave and a Longitudinal (Compressional) Wave
Frequency of a wave
Frequency: the number of waves that pass a point in a given amount of time.
Measured in Hertz (Hz)
timef
wavesof#
TEST THE RELATIONSHIP BETWEEN
WAVELENGTH AND FREQUENCY USING
SLINKYS
Go get your clicker!
What is the relationship between wavelength and frequency of waves?