What generates light and energy, and holds atoms, matter, and the world as we know it together?

• Gravitational Force

• Electromagnetic Force

• Weak Nuclear Force

• Strong Nuclear Force

The two types of charges in electric and magnetic forces are _______ and _______.

• electrons; protons

• magnetic; electric

• positive; negative

• forces; changes

What happens when electric charges are flowing through a wire?

• The wire begins to spin.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

• Absolutely nothing happens.

How many frequencies make up the Electromagnetic Spectrum?

• Five

• Three

• Nine

• Seven

Which wave has the longest wavelength and lowest frequency on the Electromagnetic Spectrum?

• Microwave

• Radio

• Visible Light

• X-Ray