Electromagnetic Energy

Something(s) to think about… What is meant by “breaking the sound barrier”? Why is the sky blue? Why can we see light before the Sun rises? And after the Sun sets?

All energy travels in waves. Energy is used to describe the amount of work that can be done by a force! (Physics) All energy travels in waves.

Types of Waves Sound, Ocean, Electromagnetic Examples of Electromagnetic Energy X-ray, Microwaves, Visible Light

Parts of a Wave Crest Wave Length Trough

The # of wavelengths that pass a point per second. Wave Frequency The # of wavelengths that pass a point per second. 1 2 3

INcoming SOLar radiATION Sun A major source of energy for Earth is radiation from the Sun. The Sun produces energy by the process of _______ ______.youtube Energy from the Sun is called ______________ INcoming SOLar radiATION nuclear fusion INSOLATION

Electromagnetic Energy All energy that can travel through space. Does not need a medium (Solid, Liquid, Gas) All matter gives off electromagnetic Energy, including Humans and Desks.

Temperature when all particles stop moving. I. Absolute Zero Temperature when all particles stop moving. Therefore, objects warmer than 0 Kelvin must be radiating electromagnetic energy. (0 on Kelvin scale) (-273º on Celsius Scale) Pg#13 ESRT

ESRT Pg 14… **Electromagnetic energy is distinguished from one another by __________.** wavelength

Electromagnetic Spectrum X Rays Gamma IR Short Wavelength High Frequency Long Wavelength Low Frequency Visible Light (Roy G Biv) Visible light is a small part of the Spectrum. But the only energy we can see!!!

Regents Questions

Sound Barrier Video Clips Please write down your observations and inferences about what is happening during each of the following video clips.

Breaking the Sound Barrier #1 Many jets breaking the sound barrier: http://www.youtube.com/watch?v=BArpqYspIgU

Breaking the Sound Barrier #2 Atlas Rocket breaking the sound barrier: http://www.youtube.com/watch?v=SsDEfu8s1Lw&feature=player_embedded

Approximately 1 mile in 5 seconds!!!!! Sound waves travel 768 mph!! Approximately 1 mile in 5 seconds!!!!!

What is meant by “breaking the sound barrier”? In the space provided write down what is meant by “breaking the sound barrier”? Please use the words “speed” and “sound waves” in your answer.

Something(s) to think about… What is meant by “breaking the sound barrier”? Why is the sky blue? Why can we see light before the Sun rises? And after the Sun sets?

Doppler Effect BLUE TOWARD ---------- RED AWAY

1. Refraction - Bent energy waves that pass through materials of varying densities causing wave direction to change.

2. Reflection When energy waves bounce off a material.

Crater Lake Reflection

CRATER LAKE NATIONAL PARK

When Energy bends in various directions. 3. Scattered: When Energy bends in various directions.

4. Transmitted Energy that passes through a material. Ex: Windows

5. Absorption Energy taken into a material. Ex. A Sponge

1. Surface Color - Dark Colors absorb more energy quickly & quickly re-radiate more energy than light colors. Energy Source Light Colors Dark Colors

Rough texture Smooth texture 2. Surface Texture ____________ increases absorption & re-radiation. Ex- Wool, Land. ____________ increases reflection and decrease absorption & re-radiation. Ex- Mirror, Water Rough texture Smooth texture

Why are Highways “Black” & the Road Surface “Rough”?

Let’s think… 1. Why is the sky blue? 2. How can we see the Sun Work in pairs to discuss possible explanations for the following questions: 1. Why is the sky blue? 2. How can we see the Sun before it rises? **Each answer must include one of the following: Refraction, reflection, scatter, transmit, or absorb.

Why is the sky blue? http://www.youtube.com/watch?v=u4hw-aXiQmc&safety_mode=true&persist_safety_mode=1

Why is the sky blue? Molecules in the air scatter blue light from the sun more than they scatter red light.  When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.

Blue Light is Scattered in the Atmosphere.

Refraction enables us to see the Sun below the horizon.

What type of energy interactions are occurring and what properties are effecting the energy interactions? 1. 2. 3. Absorbed Transmitted Reflected

Name one type of electromagnetic energy (USE PAGE 14 ESRT) 2. Electromagnetic energy is distinguished from one another by _____________. 3. Good absorbers of energy are good ___________ of energy.