Refraction, Reflection, Mirrors Monday, April 18, 2018

Unit 12: EM Spectrum/Optics Monday, 4/18  Respond to the following:  How are radio waves and Gamma rays the same?  How are radio waves and Gamma rays different?  What color is an X-ray? Upcoming dates:  Monday, 4/18 – EM Spectrum/Optics quiz – cancelled only one quiz this unit  Thursday, 4/21 – Last day to re-test on Waves  Tuesday, 4/26 - EM Spectrum/Optics quiz  Thursday, 4/28 – EM Spectrum/Optics test all missing EM Spectrum/Optics work is due (missing work is a zero after you test)  Friday, 5/6 – Atomic Physics test all missing Atomic physics work is due (missing work is a zero after you test)  Monday, 5/16 – Rube Goldberg Project due (test grade)  Friday, 5/20 – Bottle Rocket launch day (test grade)  Thursday, 5/26 – Exam review due (it is 30% of your exam grade)

Warm-up  How are radio waves and Gamma rays the same?  How are radio waves and Gamma rays different?  What color is an X-ray?

EM Spectrum Assignment - 10 minutes Draw the EM Spectrum and include the following: 1. Draw the wavelength and frequencies of each EM wave to scale. 1. Label the 7 different EM waves. 2. List two facts you have learned about radio waves, microwaves, infrared waves, ultraviolet waves, x-rays, and gamma rays. 3. Diagram the visible light spectrum and describe how each of the waves in the spectrum are different.

Uncovering the Visible Light Spectrum  Find a light source and prism to use on the back table.  In your notes respond to the following:  What did your team do to create the visible light spectrum?  What role did the light source and prism play in creating the visible light spectrum?  What medium(s) did the light wave travel through?  If the light wave traveled through different mediums, how did the wave behave?

Refraction – Guiding Questions 1. What causes refraction? 2. What happens when a light wave travels from a less dense to a more dense medium (include a diagram to support your description)? 3. What happens when a light wave travels from a more dense to a less dense medium (include a diagram to support your description)? 4. What is the index of refraction?

CN Review

the change of direction of a ray of light as it passes obliquely from one medium into another of different transmission speed

When light travels from a less dense to more dense medium (light slows down), the ray is refracted toward the normal. Example: light slows down when it passes from air into water air water n i r i > r

When light travels from a more dense medium to a less dense medium (light speeds up), the ray is refracted away from the normal. Example: light speeds up when passing from more glass into air air glass n i r i < r

An object’s ability to decrease the speed of light, and therefore cause refraction, is given by its index of refraction.

Mirrors – Video Notes  Start video at 2:25 and end on 17:35  Note: you do not need a lab sheet just make your own observations of the students in the lab.

Cool Down  How does the index of refraction effect the way a light ray will behave?

Visible Light Spectrum