The Electromagnetic Spectrum

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# The Electromagnetic Spectrum - PowerPoint PPT Presentation

The Electromagnetic Spectrum. Wavelength/frequency/energy. Teacher Page. Content: Physical Science—The Electromagnetic Spectrum Grade Level: High School Creator: Dorothy Walk Curriculum Objectives: SC 1; Intro Phys/Chem IV.A (waves). What is it?.

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### The Electromagnetic Spectrum

Wavelength/frequency/energy

The Electromagnetic Spectrum

Teacher Page
• Content: Physical Science—The Electromagnetic Spectrum
• Creator: Dorothy Walk
• Curriculum Objectives: SC 1; Intro Phys/Chem IV.A (waves)

The Electromagnetic Spectrum

What is it?
• The electromagnetic spectrum is the complete spectrum or continuum of light including radio waves, infrared, visible light, ultraviolet light, X-rays and gamma rays
• An electromagnetic wave consists of electric and magnetic fields which vibrates thus making waves.

The Electromagnetic Spectrum

Waves
• Properties of waves include speed, frequency and wavelength
• Speed (s), frequency (f) and wavelength (l) are related in the formula l x f = s
• All light travels at a speed of 3 s 108 m/s in a vacuum

The Electromagnetic Spectrum

Wavelength, Frequency and Energy
• Since all light travels at the same speed, wavelength and frequency have an indirect relationship.
• Light with a short wavelength will have a high frequency and light with a long wavelength will have a low frequency.
• Light with short wavelengths has high energy and long wavelength has low energy

The Electromagnetic Spectrum

• Low energy waves with long wavelengths
• Includes FM, AM, radar and TV waves
• Wavelengths of 10-1m and longer
• Low frequency
• Used in many devices such as remote control items, cell phones, wireless devices, etc.

The Electromagnetic Spectrum

Microwaves
• Longer than radio, shorter than light and infrared
• Wavelength 1 x 10 - 4 m to 1 x 10-1 m
• First used in radar, now used in communication, medicine and consumer use (microwave ovens)

The Electromagnetic Spectrum

Invisible electromagnetic waves that are detected as heat

Can be detected with special devices such as night goggles

Used in heat lamps

Higher energy than microwaves but lower than visible light

Infrared waves

The Electromagnetic Spectrum

Visible Light
• The portion of the electromagnetic spectrum that human eyes can detect
• ROY G BIV (red, orange, yellow, green, blue, indigo, violet)
• Red is the lowest frequency and violet is the highest frequency

The Electromagnetic Spectrum

Ultraviolet waves
• Higher energy than light waves
• Can cause skin cancer and blindness in humans
• Used in tanning beds and sterilizing equipment

The Electromagnetic Spectrum

X-Rays
• High energy waves
• First discovered by Roentgen
• Used in medicine, industry and astronomy
• Can cause cancer

The Electromagnetic Spectrum

Gamma rays
• Highest energy
• Blocked from Earth’s surface by atmosphere

The Electromagnetic Spectrum

Time to think…..
• 1. What is the relationship between frequency and wavelength?
• 2. What is meant by ‘spectrum’?
• 3. What does ROY G BIV mean?

The Electromagnetic Spectrum

Now, let’s really think
• 4. Can you actually see x-rays?
• 5. Which color is more energetic, red or yellow?
• 6. Which type of wave travels faster, gamma or radio?
• 7. Why are microwaves more dangerous than radio waves?

The Electromagnetic Spectrum

• You have just been involved in a traffic incident that leaves you stranded on the side of the road. Which part of the electromagnetic spectrum would be of the most use to you and why?

The Electromagnetic Spectrum