Slide 1 / 57 Slide 2 / 57 8th Grade Electromagnetic Radiation CW-HW Slides 2015-10-23 www.njctl.org Slide 3 / 57 Slide 4 / 57 1 What are some sources of electromagnetic radiation? Classwork #1: What is Electromagnetic Radiation c = λf c = 300,000,000 m/s time (s) = distance (m)/ speed (m/s) Slide 5 / 57 Slide 6 / 57 2 What is meant by the term “medium”? 3 Why can electromagnetic waves travel through a vacuum?
Slide 7 / 57 Slide 8 / 57 4 What speed do all electromagnetic waves travel at 5 Red light, a type of electromagnetic wave, has a in vacuum? wavelength of 0.0000078 meters, what is its frequency in Hz? Slide 9 / 57 Slide 10 / 57 6 Most kitchen microwaves operate at a frequency 7 Alpha Centauri is the nearest star to Earth at of 2,450 MHz or 2,450,000,000 Hz. What is the 41,342,509,100,000,000 meters away. How long wavelength of these microwaves? would it take a radio signal – a type of electromagnetic wave – from Alpha Centauri to reach Earth? Slide 11 / 57 Slide 12 / 57 8 TV channels 5 and 6 broadcast frequencies between 76 and 88 MHz. What is the wavelength of a 76 MHz frequency? Homework: What is Electromagnetic Radiation
Slide 13 / 57 Slide 14 / 57 9 What do X-rays, light, microwaves, and radio 10 All electromagnetic waves travel at what speed in waves all have in common? a vacuum? Slide 15 / 57 Slide 16 / 57 11 What is a vacuum? 12 When electromagnetic waves travel through matter, what happens to their speed? Slide 17 / 57 Slide 18 / 57 13 Which of the following electromagnetic waves has 14 How does the frequency of an electromagnetic the highest frequency: 1.0 m wavelength, 100 m wave with a long wavelength compare to the wavelength, 0.001 m wavelength, or 1,0000 m frequency of an electromagnetic wave with a wavelength? short wavelength?
Slide 19 / 57 Slide 20 / 57 15 What does the term “spectrum” mean? Classwork #2: The Electromagnetic Spectrum Slide 21 / 57 Slide 22 / 57 16 What happens to the energy of a wave as the 17 What happens to the energy of a wave as the frequency of a wave increases? wavelength of a wave increases? Slide 23 / 57 Slide 24 / 57 18 What form of electromagnetic wave has the 19 What form of electromagnetic wave has the highest energy? lowest energy?
Slide 25 / 57 Slide 26 / 57 20 Which color in the visible portion of the 21 Rank the following forms of electromagnetic electromagnetic spectrum carries the most radiation in order of increasing energy: energy? Infrared Waves, Radio Waves, X-Rays Slide 27 / 57 Slide 28 / 57 22 Rank the following forms of electromagnetic radiation in order of increasing energy: Gamma Rays, Microwaves, Ultraviolet Homework: The Electromagnetic Spectrum Slide 29 / 57 Slide 30 / 57 23 In order for a radio to work, what two items are 24 What are 5 ways microwaves are used? needed?
Slide 31 / 57 Slide 32 / 57 25 What are the three major categories of light 26 Describe characteristics/ uses of the three major electromagnetic radiation? categories identified in #25. Slide 33 / 57 Slide 34 / 57 27 Rank the following in order from longest to 28 What does the acronym ROYGBIV stand for and shortest wavelength: what is its purpose? red light, infrared, ultraviolet, and violet light. Slide 35 / 57 Slide 36 / 57 29 How does the amplitude of a visible light wave 30 What are the two highest energy types of relate to the light's brightness? electromagnetic radiation and what are they used for?
Slide 37 / 57 Slide 38 / 57 31 What is the imaginary line perpendicular to the surface of a material called? Classwork #3: Light Interactions with Matter Slide 39 / 57 Slide 40 / 57 32 The angle between the incoming light and the line 33 What is the angle between the reflected light and asked for in #31 is called what? the line in #31 called? Slide 41 / 57 Slide 42 / 57 34 What is the relationship between the two angles in 35 What is another term for the bending of light? #32 and #33?
Slide 43 / 57 Slide 44 / 57 36 In order for light to refract what two conditions 37 Explain what causes light to refract as it goes from one medium to another. must be met? Slide 45 / 57 Slide 46 / 57 38 If light enters a denser material from one that is 39 If light enters a less dense material from one that less dense, how will the light behave? is denser, how will the light behave? Slide 47 / 57 Slide 48 / 57 40 Based on the diagram below, which substance is denser? How do you know Homework: Light Interactions with Matter
Slide 49 / 57 Slide 50 / 57 41 What does the light ray B represent? How about 42 When light enters a substance with a different ray C? Explain. density, what is the angle of reflection? Slide 51 / 57 Slide 52 / 57 43 How does the angle of refraction for light with a 44 How does the angle of refraction compare for red higher frequency compare to that of a lower and violet light passing through the same object? frequency light? Explain. Slide 53 / 57 Slide 54 / 57 45 If a light passes from air, through glass, and back into air, how does the angle of refraction from glass to air compare to the angle of incidence from air to glass? Classwork: Examples of Light Interactions with Matter
Slide 55 / 57 Slide 56 / 57 46 How is refraction and reflection involved in the 47 What causes the white areas to show up on an formation of rainbows? x-ray image? Slide 57 / 57 48 Explain how digital cameras capture images.
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