Questions we learned…but maybe forgot.

Why is the sky blue? Why are sunsets red?

Ahhh! I need a review!

A QUICK LOOK AT THE

ELECTROMAGNETIC SPECTRUM

Objective for the day

By the end of the day…

SWBAT generalize and explain the relationship between the color of light and wavelength within the electromagnetic spectrum.

Remembering…Electromagnetic Waves

Electromagnetic waves are mostly invisible waves that carry energy.

They have both electric and magnetic properties, hence the name.

We already learned about radiation. Radiation is energy that is transmitted by

electromagnetic waves.

Electromagnetic waves are mostly invisible waves that carry energy.

They have both electric and magnetic properties, hence the name.

We already learned about radiation. Radiation is energy that is transmitted by

electromagnetic waves.

EM waves are all around you!

Classification of EM waves

Electromagnetic waves are classified according to wavelength.

This is called the Electromagnetic Spectrum

Electromagnetic waves are classified according to wavelength.

This is called the Electromagnetic Spectrum

longest wavelength shortest wavelength

Know the order of the EM spectrum! Ron’s Mother InVited Us to Xavier’s Garden Ron’s Mother InVited Us to Xavier’s Garden

longest wavelength shortest wavelength

Visible light

Know the order of visible light

longest wavelength shortest wavelength

Know the order of the EM spectrum! Ron’s Mother InVited Us to Xavier’s Garden Ron’s Mother InVited Us to Xavier’s Garden

longest wavelength shortest wavelength

Review & Practice Q: Which has the LONGER wavelength:

Microwaves or Ultraviolet radiation?

longest wavelength shortest wavelength

Review & Practice Q: Which has the SHORTER wavelength:

Yellow light or X-rays?

longest wavelength shortest wavelength

So why is the sky blue?

The sun shines down white light, but white light is a mix of all of the visible colors.

White light interacts with the atmosphere (nitrogen, oxygen, and other gases).

The sun shines down white light, but white light is a mix of all of the visible colors.

White light interacts with the atmosphere (nitrogen, oxygen, and other gases).

So why is the sky blue?

Longer wavelengths of light pass through nitrogen and oxygen, while shorter wavelengths collide and scatter.

We see the scattered light, which is the blue light.

Longer wavelengths of light pass through nitrogen and oxygen, while shorter wavelengths collide and scatter.

We see the scattered light, which is the blue light.

Why are sunsets red?

Why are sunsets red?

Unit Overview

Weather versus Climate Clouds Heat & Temperature Density & Pressure Water Cycle Wind

Exit Ticket

1) Which has a SHORTER wavelength?Red light or purple light

2) Order these according to INCREASING wavelength:

x-rays, ultraviolet, microwave, infrared

3) Give an explanation of why the sky appears blue.