7.Science.L16.EMRadiation

Electromagnetic Spectrum

Electromagnetic Spectrum

• The electromagnetic (EM) spectrum is the range of all types of light radiation. The light energy that makes up the electromagnetic spectrum are: microwaves, infrared light, visible light, ultraviolet light, X-rays and gamma-rays.

• Visible Light is the ONLY light we can see.

Energy travels in waves

• There are two types of waves: (1) Mechanical waves and (2) Electromagnetic waves

• Mechanical waves need a medium (matter) to travel through.

• Electromagnetic waves do NOT need a medium (matter) in order to travel.

Multiple Choice

How do electromagnetic and mechanical waves compare?

• Mechanical waves can only travel through a vacuum, but electromagnetic waves can travel through a solid, liquid, or gas.

• Mechanical waves can only travel through a solid, liquid, or gas, but electromagnetic waves can travel through a vacuum.

• Mechanical waves can travel through a solid, liquid, or gas, but electromagnetic waves can only travel through a gas.

• mechanical waves can travel through a solid, liquid, or gas, but electromagnetic waves can only travel through a solid.

Multiple Choice

A student asks a series of questions about a wave. The answer to which question will allow the student to determine whether the wave is electromagnetic or mechanical?

• Does it require a medium (matter) in order to travel?

• Does it have a measurable speed?

• Can it pass through air and water?

• Does it have a measurable frequency.

Light waves are Transverse waves

• Crest = tallest part of the wave

• Trough = Lowest part of the wave

• Amplitude = The distance between the Crest/Trough and the middle part of the wave. How tall the wave is.

• Wavelength = The distance between 2 Crests/Troughs.

Multiple Choice

A student is measuring the distance between the crest and the rest position of both a mechanical wave and an electromagnetic wave. Which question is the student trying to answer?

• What is the speed of the waves?

• What is the wavelength of the waves?

• What is the amplitude of the waves?

• What is the frequency of the waves?

Multiple Choice

Which distance represents the wavelength?

Click on the image to the left to answer the question.

• W

• Y

• X

• Z

Multiple Choice

Which distance represents the amplitude?

Click on the image to the left to answer the question.

• W

• Y

• X

• Z

Multiple Choice

What do radio waves, microwaves, X-rays, and gamma rays all have in common?

• They all have the same wavelength.

• They are detected in the same way.

• They are electromagnetic waves.

• They store the same amount of energy.

Energy

• The shorter the wavelength = the more energy a wave has. If the wave travels at a high frequency it means it travels quickly.

• The longer the wavelength = the less energy a wave has. If the wave travels at a low frequency it means it travels slowly.

Multiple Choice

Wavelength with a large wavelength will have a __________ frequency and ____________ energy.

• high, low

• low, high

• high, high

• low, low

Multiple Choice

Select the correct order of waves on the EMS.

• Radio, Microwaves, Infrared, Visible, Ultra-violet, X-rays, Gamma rays

• Visible light, Microwaves, Infrared, Ultra Violet, X-ray, Gamma, Radio

• Gamma, X-ray, Ultra violet, Visible, Infrared, Microwave, Radio

• Microwave, Radio, Visible, Infrared, Ultra-violet, X-ray, Gamma ray.

Multiple Choice

Which has the LONGEST wavelength and, therefore, the lowest frequency/energy?

Click the image to the left to answer the question.

• Gamma Rays

• Visible Light

• Radio Waves

• Infrared rays

Multiple Choice

Which has the SHORTEST wavelength and, therefore, the highest frequency/most energy.

Click on the image to the left to answer the question.

• Radio Waves

• Gamma Rays

• Ultraviolet Rays

• X-rays

Multiple Choice

Which section of the spectrum is the ONLY one we can see?

• X-rays

• Gamma Rays

• Visible Light

• Ultraviolet Rays

Multiple Choice

As the frequency of an electromagnetic wave increases, the amount of energy in that wave...

• Increases

• stays the same.

• decreases

Multiple Choice

The height of the wave is known as the ______________.

• Amplitude

• Trough

• Crest

• Wavelength

Multiple Choice

The blue section of the wave is measuring _______________.

Click on the image to the left to answer the question.

• Wavelength

• Trough

• Crest

• Amplitude

Multiple Choice

How are electromagnetic waves different from other waves?

• They have very short wavelengths

• They can travel through empty space.

• They transmit energy instead of matter.

• They can change directions by reflection.

Multiple Choice

High frequency waves have _____________ wavelengths.

Click on the image to the left to answer the question.

• Varying

• The same

• Long

• Short

Multiple Choice

What are electromagnetic waves?

• sound waves

• someone's name

• electric & magnetic fields (energy) that travel through empty space very quickly

• things like longitudinal waves