do now! i love dr adams!. topic 3 waves this lesson what is a wave? longitudinal and transverse...
TRANSCRIPT
![Page 1: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/1.jpg)
Do now!
I love Dr Adams!
![Page 2: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/2.jpg)
Topic 3 Waves
![Page 3: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/3.jpg)
This lesson
• What is a wave?
• Longitudinal and transverse waves
• Amplitude, wavelength, frequency and period of a wave
• The relationship between frequency and period
• The wave equation
![Page 4: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/4.jpg)
What is a wave?
YouTube - Water bubble in Space (zero gravity)
![Page 5: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/5.jpg)
Waves
Waves can transfer energy and information without a net motion of the medium through which they travel.
They involve vibrations (oscillations) of some sort.
![Page 6: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/6.jpg)
Waves
Waves can transfer energy and information without a net motion of the medium through which they travel.
They involve vibrations (oscillations) of some sort.
Can you do something very boring and traditional………
Can you copy this please?
![Page 7: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/7.jpg)
Rays
Rays highlight the direction of energy transfer.
![Page 8: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/8.jpg)
Transverse waves
The oscillations are perpendicular to the direction of energy transfer.
Direction of energy transfer
oscillation
![Page 9: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/9.jpg)
Transverse waves
peak
trough
![Page 10: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/10.jpg)
Transverse waves
• Water ripples
• Light
• On a rope/slinky
• Earthquake
![Page 11: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/11.jpg)
Longitudinal waves
The oscillations are parallel to the direction of energy transfer.
Direction of energy transfer
oscillation
![Page 12: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/12.jpg)
Longitudianl waves
compression
rarefraction
![Page 13: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/13.jpg)
Longitudinal waves
• Sound
• Slinky
• Earthquake
![Page 14: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/14.jpg)
Wave measurements
![Page 15: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/15.jpg)
Amplitude - A
The maximum displacement from the mean position.
amplitude
![Page 16: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/16.jpg)
Period - T
The time taken (in seconds) for one complete oscillation. It is also the time taken for a complete wave to pass a given point.
One complete wave
![Page 17: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/17.jpg)
Frequency - f
The number of oscillations in one second. Measured in Hertz.
50 Hz = 50 vibrations/waves/oscillations in one second.
![Page 18: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/18.jpg)
Period and frequency
Period and frequency are reciprocals of each other
f = 1/T T = 1/f
![Page 19: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/19.jpg)
Wavelength - λ
The length of one complete wave.
wavelength
![Page 20: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/20.jpg)
Wave speed - v
The speed at which the wave fronts pass a stationary observer.
330 m.s-1
YouTube - Bill Nye the Science Guy - 51: Waves 1/3
![Page 21: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/21.jpg)
The Wave Equation
The time taken for one complete oscillation is the period T. In this time, the wave will have moved one wavelength λ.
The speed of the wave therefore is distance/time
v = λ/T = fλv
λf x
![Page 22: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/22.jpg)
The Wave Equation
The time taken for one complete oscillation is the period T. In this time, the wave will have moved one wavelength λ.
The speed of the wave therefore is distance/time
v = fλv
λf xCan you copy this part please?
![Page 23: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/23.jpg)
1) A water wave has a frequency of 2Hz and a wavelength of 0.3m. How fast is it moving?
2) A water wave travels through a pond with a speed of 1m/s and a frequency of 5Hz. What is the wavelength of the waves?
3) The speed of sound is 330m/s (in air). When Dave hears this sound his ear vibrates 660 times a second. What was the wavelength of the sound?
4) Purple light has a wavelength of around 6x10-7m and a frequency of 5x1014Hz. What is the speed of purple light?
Some example wave equation questions
0.2m
0.5m
0.6m/s
3x108m/s
![Page 24: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/24.jpg)
Wave equation questions
vλf x
![Page 25: Do now! I love Dr Adams!. Topic 3 Waves This lesson What is a wave? Longitudinal and transverse waves Amplitude, wavelength, frequency and period of](https://reader036.vdocuments.net/reader036/viewer/2022062322/5697c01b1a28abf838ccf7be/html5/thumbnails/25.jpg)
Let’s try some questions!
Yay!!