Electromagnetic Waves

Electromagnetic waves...

• Needs matter to transfer energy.

• Do not need matter to transfer energy.

• Only needs matter sometimes

Electromagnetic waves...

• Are made by vibrating electric charges and can travel through space.

• Are made by shining electric charges and can travel through space.

Any moving electric charge is surrounded by an _________ and a magnetic field.

• electric light

• magnetic field

• electric field

What happens when electric and magnetic fields change?

• A changing magnetic field creates the same electric field.

• A changing magnetic field creates a changing electric field.

• A changing magnetic field creates a burning fire field.

Name one example of what transfers electric energy from one circuit to another circuit.

• generator

• voltmeter

• transformer

• hosepipe

What is this?

• Sound Wave

• Radioactive Wave

• Electromagnetic Wave

• Magnetic Wave

When an electric charge vibrates, the electric field around it changes creating a changing ________________ .

• magnetic field

• radio active field

• electron field

• sound field

The magnetic and electric fields _________________________.

• create each other only once

• create each other again and again

What is the speed of EM waves?

• 3 km/s

• 300,000 km/h

• 300 km/s

• 300,000 km/s

EM waves usually travel slowest in solids and fastest in gases.

• True

• False