Electromagnetic Radiation ม3

Electromagnetic energy is measured using what unit?

• Hertz

• Photon

• Watt

• Quarks

All waves carry ________ as they travel from one place to another.

• matter

• space

• energy

• water

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NGSS.MS-PS4-1

Electromagnetic waves vary in

• the speed they travel in a vacuum.

• wavelength and frequency.

• the way they reflect.

• the orientation of their electric and magnetic fields.

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How are Electromagnetic waves different from Mechanical waves?

• EM waves have very short wavelengths

• EM waves transmit energy instead of matter

• EM waves can travel through the vacuum of space (without particles)

• EM waves can change direction by reflection

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NGSS.HS-PS4-3

Wavelength and Frequency are related in that...

• they are always the same

• when one increases, the other decreases (inversely proportional)

• there is no correlation

• they both vary in an irregular pattern

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NGSS.HS-PS4-1

What is the source of an electromgnetic wave?

• A magnet

• The wind

• A vibrating particle

• A disturbance in the force

In what direction does a wave propegate from its source?

• To the north

• In all directions

• Only downwards

• To the right

An electromagnetic wave consists of an magnetic field & an electric field. What is their relationship in the wave?

• They travel in opposite directions

• They travel parallel to each other

• They travel perpendicular to each other

• They travel at 45 degree angles to each other

Ait what speed do electromagnetic waves travel in empty space?

• 30 m/s

• 3,000 m/s

• 300,000 m/s

• 300,000,000 m/s

The sun's energy reaches earh as electromagnetic waves. The majority of this energy is in what three forms?

• Gamma-rays

• Infrared

• Visible light

• Ultraviolet