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The Electromagnetic Spectrum

The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

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Page 1: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

The Electromagnetic Spectrum

Page 2: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

In this session we will,

• Review the electromagnetic spectrum

• Discuss the various forms of energy represented on the electromagnetic spectrum

Page 3: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Before we begin, let’s see what you already know………

• What is an electromagnetic wave?

• Who can define the properties of a wave, including wavelength and frequency?

Page 4: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Electromagnetic Waves

Page 5: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

The Electromagnetic Spectrum

Page 6: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Radio Waves

• Wavelengths range from hundreds of meters to about 1 mm

• Used by antennas to transmit data, such as TV, radio, wireless networks

Page 7: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Microwaves

• Can pierce through fog and rain—ideal for transmitting cell phone signals

• No known object in nature that emits microwaves

• They are only known to be created by man-made technologies

Page 8: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Infrared Waves

• Emitted by warm bodies and absorbed by cool bodies– For example, emitted

by our sun and absorbed by our skin

• We feel as heat

• Used in technology applications such as night vision

Page 9: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Visible Light

• Very small part of the spectrum

• The colors of the rainbow and all the hues in between that humans can see

Page 10: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Ultraviolet Waves

• Radiated from hot bodies like stars, including our Sun

• We can’t see them, but our skin is sensitive to them– Sunburn from

exposure• Evidence that bees and

some birds can see UV waves; helps find food

Page 11: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

X-rays

• Originate in nature, deep in space– From exploding nova and

supernova; also emitted by the Sun

• Can also be created by machines, like the one your doctor uses– Shoot electrons at a piece of

metal– The metal then releases x-

rays– The x-rays penetrate the body

but are blocked by bones

Page 12: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Gamma Rays

• Shortest frequency and highest wavelength of EM spectrum

• Can pass through all matter and have very high energy

• Can be used by doctors to kill cancer cells but can also be dangerous to the body’s other cells

Page 13: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Matching Game Review

Type of Wave

• Radio• Microwave• Infrared• Visible Light• Ultraviolet• X-ray• Gamma

Descriptiona) Only part of the spectrum

humans can see

b) Penetrate the body but are blocked by bones

c) Highest energy on the spectrum

d) Longest wavelength on the spectrum

e) No known object in nature emits these

f) Used by antennas to transfer data

g) Used for night vision

Page 14: The Electromagnetic Spectrum. In this session we will, Review the electromagnetic spectrum Discuss the various forms of energy represented on the electromagnetic

Review and Reflection

Type of Wave Something I learned Questions I have

Radio

Microwaves

Infrared

Visible Light

Ultraviolet

X-ray

Gamma