Electromagnetic Spectrum

Electromagnetic

Spectrum

PS.7.

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What is the Electromagnetic

Spectrum?

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● All electromagnetic waves are TRANSVERSE

​Electromagnetic Spectrum

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Did you know?

●
Can be made up of particles
of light called PHOTONS

●
Produced by the movement
of electrically charged
particles

●
DO NOT need a medium to
travel

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Radio Waves

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● Longest wavelength

● Lowest frequency

● Lowest energy

Radio Waves

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Did you know?

● Often used to transmit data through radio,

satellites, radar, and computer networks.

● They are also used in cell phones

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Microwaves

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● Second longest wavelength

● Second lowest frequency

● Second lowest energy

Microwaves

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Did you know?

● Used in microwave ovens, Bluetooth

headsets/game controllers/remotes, RADAR
(to catch speeders on the road), GPS

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Infrared Waves

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● Low energy

● Low frequency

Infrared Waves

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Did you know?

● Used in night vision goggles, some remote

controls, heat seeking missiles, heat lamps
at restaurants

Multiple Choice

Which EM waves have the longest wavelength?

• radio

• x-rays

• ultraviolet

• gamma rays

Multiple Choice

The diagram below shows a pencil in a glass of water. When viewed from the side, the pencil appears to be broken. What process causes this to happen?

• absorption

• evaporation

• reflection

• refraction

Multiple Choice

The diagram below shows a light ray. In this diagram, the light ray is being

•  transmitted

• absorbed

• reflected

• refracted

Multiple Choice

The diagram shows a person observing a thunderstorm located several kilometers away. The person hears the thunder several seconds after seeing the lightning. Which statement accurately explains the difference in observations of sound and light by the observer?

 

• Human eyes see light faster than their ears can hear sound.

• The medium the waves are traveling through is different for each type of wave.

• Light waves travel faster than sound waves.

• Sound waves travel faster than light waves.

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Visible Light

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● The only EMS wave we can see with the

human eye

Visible Light

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Did you know?

Red---Orange---Yellow---Green---Blue---Indigo---Violet

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Ultraviolet Light

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● Shorter wavelengths than visible light

Ultraviolet Light

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Did you know?

● Often used in blacklights, for sterilizing

medical supplies, water disinfection, security
images on money

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X-Rays

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● Small wavelength

● High energy

● High frequency

X-Rays

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Did you know?

● Often used for medical imaging, airport

security, inspecting industrial welds

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Gamma Rays

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● Shortest wavelength

● Highest energy

● Highest frequency

Gamma Rays

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Did you know?

● Can be used in cancer treatment and the

food industry (kills harmful bacteria such as
yeast)

Multiple Choice

What is the correct order of the visible light spectrum starting with the longer wavelength?

• Red, yellow, orange, blue, violet, indigo

• Violet, indigo, blue, green, yellow, orange, red

• Green, yellow, blue, indigo, red, orange

• Red, orange, yellow, green, blue, indigo, violet

Multiple Choice

What gases are in the unknown mixture?

• Gas B & Gas D

• Gas C & Gas B

• Gas A & Gas D

• Gas D & Gas C

Multiple Choice

Which color has the longest wavelength?

• Yellow

• Red

• Green

• Purple

Multiple Choice

Electromagnetic waves that help your body produce vitamin D are called?

• ultraviolet rays

• x-rays

• gamma rays

Multiple Choice

3. Which type of waves are used in broadcasting?

• radio waves

• x-rays

• infrared rays

Multiple Choice

Which electromagnetic waves have the highest frequencies and the shortest wavelengths?

• microwaves

• visible light

• gamma rays

Multiple Choice

What is white light?

• The type of Light that is found in x-rays

• the type of light given off by the Sun and lightbulbs

• the type of light found in Microwave ovens

• the type of light that makes up radio waves

Multiple Choice

What type of wavelengths do ultraviolet rays have?

• short

• long

• alternating short and long

• none

Match

Match the following

• Radio waves

• Microwaves

• Infrared rays

• UV rays

• Gamma Rays

Has the longest wavelengths and the lowest frequency

Used in cell phone communication and police radar systems

It is used in thermal imaging

Overexposure to this can result in sunburns and skin cancer

Has the highest energy of all electromagnetic radiation and is the most damaging to human tissue

• Has the longest wavelengths and the lowest frequency

• Used in cell phone communication and police radar systems

• It is used in thermal imaging

• Overexposure to this can result in sunburns and skin cancer

• Has the highest energy of all electromagnetic radiation and is the most damaging to human tissue

Multiple Choice

A leaf is green. What does this tell you about the light that is being absorbed?

• the light is a UV ray

• the light is not part of the light spectrum

• all colors are reflected except green

• all colors are absorbed except green

Multiple Choice

Radiant energy spreads out from its source in all directions.

• True

• False

Multiple Choice

Both X-rays and gamma rays have higher frequencies than ultraviolet rays.

• True

• False

Multiple Choice

Communicating with satellites is an application of gamma rays.

• True

• False

Reorder

Reorder the following according to the spectrum

• red

• orange

• yellow

• green

• blue

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5