What is the primary source of Earth's radiant energy?

• The Sun

• The Moon

• Stars

• Planets

Tags

Understanding

Electromagnetic waves can travel through empty space and through ___.

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Understanding

How do electromagnetic waves form?

• By the acceleration of an electric charge

• By the deceleration of a magnetic field

• By the vibration of a neutral particle

• By the collision of two waves

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Applying

What happens to electromagnetic waves when they encounter matter?

• They slow down

• They speed up

• They stop

• They change direction

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Applying

Which of the following electromagnetic waves has the highest energy?

• Ultraviolet waves

• Visible light waves

• Infrared waves

• Radio waves

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Analyzing

Electromagnetic waves are classified as ___ waves because the disturbance is perpendicular to the direction they travel.

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Understanding

What percentage of the Sun's electromagnetic waves are infrared waves?

• 49%

• 44%

• 7%

• 30%

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Analyzing

What produces the different wavelengths from the sun?

• Solar flares and sunspots from areas in the sun

• Different temperatures from areas in the sun.

• Reflection of light from the Earth by the sun

• Absorption by the atmosphere from the sun

Reorder the following steps that create an electromagnetic wave.

• When the electric field is strongest in one direction, the magnetic field is strongest perpendicular to that direction.

• An electric charge is surrounded by an electric field. If the charge moves up and down, the field also moves up and down.

• A changing electric field produces a magnetic field. A changing magnetic field produces a changing electric field.

• The vibration of the charge starts a wave of vibrating electric and magnetic fields that moves outward in all directions.