(Savvas 18.1) Ch. 18.1 Electromagnetic Waves

Electromagnetic waves can travel through a vacuum. (True/False)

• True

• False

Which wave fits the particle model?

• Electromagnetic

• Mechanical

• Both

• None

Electromagnetic waves are produced when a(n) _______ vibrates or accelerates.

• Electron

• Proton

• Neutron

• Atom

Magnetic fields are produced by magnets, by changing _______, and by vibrating charges.

• A) Electric fields

• B) Magnetic poles

• C) Electric currents

• D) Light waves

Electromagnetic waves are produced when an electric charge _______.

• Stays still

• Vibrates

• Disappears

• Changes color

What happens when electric and magnetic fields change?

• They disappear

• They regenerate each other

• They become weaker

• They stop moving

Is the following sentence true or false? All electromagnetic waves travel at the same speed through a vacuum.

• True

• False

Circle the letter that gives the correct speed of light in a vacuum.

• 3.00 x 10^8 kilometers per second

• 3.00 x 10^8 meters per hour

• 3.00 x 10^8 meters per second

• 3.00 x 10^8 kilometers per hour

As the wavelengths of electromagnetic waves increase, the frequencies ________, for waves moving in a(n) ________.

• increase, vacuum

• decrease, medium

• remain constant, vacuum

• decrease, vacuum

Interference only occurs when two or more waves overlap, so a ________ experiment showed that light behaves like a ________.

• double-slit, wave

• single-slit, particle

• double-slit, particle

• single-slit, wave