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Continuity of Learning Assignments Grade: 8th grade Subject: Science
Day 21 & 22 Day 23 and 24 Day 25 and 26 Day 27 and 28 Day 29 and 30 Essential Activity
Science 8. 6 Waves- Read stemscopedia and complete the Definition Continum
Essential Activity Science 8. 6 Waves- Independent Practice
Essential Activity Science 8.6 Waves- Math Connections
Essential Activity Science 8. 6 Waves all around- reading passage
Essential Activity Science 8.6 Waves Visible Light
Extension Science www.phet.colorado.edu (interactive simulations) Waves on a string Waves interference Waves introduction Use a metal spoon to explore convex and concave mirrors Make a homemade cups on a string telephone (practice communicating on it and then explain how it works) Stemscopes online activites- log in via clever.com and then use MSIS without leading zeros to log in.
Extension Science www.phet.colorado.edu (interactive simulations) Waves on a string Waves interference Waves introduction Use a metal spoon to explore convex and concave mirrors Make a homemade cups on a string telephone (practice communicating on it and then explain how it works)
Stemscopes online activites- log in via clever.com and then use MSIS without leading zeros to log in.
Extension Science www.phet.colorado.edu (interactive simulations) Waves on a string Waves interference Waves introduction Use a metal spoon to explore convex and concave mirrors Make a homemade cups on a string telephone (practice communicating on it and then explain how it works) Stemscopes online activites- log in via clever.com and then use MSIS without leading zeros to log in.
Extension Science www.phet.colorado.edu (interactive simulations) Waves on a string Waves interference Waves introduction Use a metal spoon to explore convex and concave mirrors Make a homemade cups on a string telephone (practice communicating on it and then explain how it works) Stemscopes online activites- log in via clever.com and then use MSIS without leading zeros to log in.
Extension Science www.phet.colorado.edu (interactive simulations) Waves on a string Waves interference Waves introduction Use a metal spoon to explore convex and concave mirrors Make a homemade cups on a string telephone (practice communicating on it and then explain how it works)
Stemscopes online activites- log in via clever.com and then use MSIS without leading zeros to log in.
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Introduction to Properties of Waves (C)
Waves All Around
1 How long has it been since you watched waves at the beach? Did you pay attention to their shapes? If you are standing at the shore, they look like they are coming right at you. But what if you walk out on a pier jutting into the water? Ocean waves look a bit different when you view them from their side.
2 If you watch one spot, you can see that the water rises and dips in a regular pattern. Pick something floating on the waves to be your reference point—perhaps a seagull or a bobbing piece of flotsam. You will see that the object moves forward a little bit as the water goes up and then moves backward as the water goes down. The water molecules are not actually being moved to the shore. The waves represent areas of pressure moving through the water, and the water is pushed upward as it is compressed by the higher pressure portions of the wave. The way that the height of the water changes over time follows a pattern physicists refer to as a standing wave. Waves can be characterized by three properties: wavelength, frequency, and amplitude. Unlike many waves in nature, you can easily observe these properties on your own in ocean waves.
3 The very highest point of each wave is the peak, and the lowest is the trough. The horizontal
distance from peak to peak (or trough to trough) is the wavelength. The frequency is how many peaks go by in a certain amount of time. For waves on the ocean, we might report frequency as waves per minute. For waves with higher frequency, a unit called Hertz (Hz) has been created. One Hz is 1 cycle per second, where one cycle is the passing of a wave from one peak to the next. The last property is amplitude, which is the vertical distance from the height of the peak to the level of the trough, divided by 2. In other words, imagine a line that travels along the middle height of the wave. The amplitude is the distance from that line to a peak or trough. We can look at a few examples of other waves in nature that are almost the same shape as ocean waves and can be described by the same properties.
4 First, imagine that you have tied one end of a rope to a door knob. If you stand so that your arm is pointed at the door knob, the taut rope shows the middle line we use to measure amplitude. If you give the rope some slack and move your arm up and down, you will see a wave in the rope. The amplitude is large on the end that you hold, but closer to the door knob, the rope cannot move up and down as far, so the amplitude of the wave decreases until it is zero at the knot.
1
Introduction to Properties of Waves (C)
5 Another type of wave is the sound wave, which moves through matter such as air or water as a pressure wave. When sound waves are fed into a device called an oscilloscope, it will show the sound wave as a picture on a screen. A note of a single pitch, like from a flute or an opera singer, will show up as a regular wave. A really low note will have a low frequency, while a note of high pitch has a high frequency. When the opera singer hits “high C,” she is producing sound waves at 1,046.5 Hz. In contrast, 20 Hz is about the lowest frequency a person can hear.
6 Light can also be described by a wave. We are not able to see the form of these waves, but we can model them mathematically. Visible light does not have a different “pitch” like sound, but it does come in different colors. It is the property of wavelength that changes when we compare light of different colors. The wavelengths of light are extremely small, so a special unit of distance called a nanometer (nm) is used to report light wavelengths. There are 1 billion (1,000,000,000) nanometers in 1 meter. Violet light has the shortest wavelength at 400 nm, while red light, at 740 nm, has the longest wavelength of visible light. In contrast, the wavelengths of sound waves are measured in centimeters.
2
Introduction to Properties of Waves (C)
1. What is the main point of paragraph 3?
A. To define the unit Hertz
B. To fully describe ocean waves
C. To explain the three properties of waves
D. To let the reader know that there are many different types of waves in nature
2. Which property of a wave is labeled X on the diagram above?
A. Amplitude
B. Frequency
C. Wavelength
D. None of the above
3. Which phrase helps you understand the meaning of vertical in paragraph 3?
A. height of the peak
B. divided by 2
C. imagine a line
D. along the middle
3
Introduction to Properties of Waves (C)
4. A subwoofer is a type of speaker which plays only the very low notes in a song or movie. Which of the following frequencies would you expect to be able to hear from a subwoofer?
A. 10 Hz
B. 25 Hz
C. 750 Hz
D. 1,050 Hz
5. Amplitude can be described as:
A. the distance between each peak.
B. the distance between the rest position of the wave and the peak or trough.
C. the number of cycles per second.
D. the wavelength of visible light.
4