What type of wave is a combination of electric and magnetic fields?

• electromagnetic wave

• longitudinal wave

• mechanical wave

• transverse wave

What do you call the bundles of wave energy?

• electrons

• protons

• photons

• neutrons

Which of the following statements is FALSE?

• EM waves can travel in a vacuum.

• A wave is a disturbance that transfers energy.

• Most EM waves are invisible and undetectable.

• EM waves do not need a medium to propagate.

What is the frequency of radio waves with a wavelength of 1.5 x 10³ m? Assume that the waves propagate in a vacuum.

• 1 x 10⁴ Hz

• 2 x 10⁴ Hz

• 1.5 x 10⁵ Hz

• 2 x 10⁵ Hz

Who discovered radio waves? The SI unit for frequency was named in his honor.

• Hans Christian Oersted

• Heinrich Hertz

• James Clerk Maxwell

• Sir Frederick William Herschel

What type of EM wave is used in radar?

• infrared

• microwave

• radio wave

• ultraviolet

Who discovered infrared?

• Hans Christian Oersted

• Heinrich Hertz

• James Clerk Maxwell

• Sir Frederick William Herschel

Some night-vision goggles use _______.

• infrared

• microwave

• radio wave

• visible light

Banks use ______ lamps to check the signature on a passbook and to identify fake banknotes.

• infrared

• microwave

• UV

• visible light

The following are applications of visible light EXCEPT ______.

• artificial lighting

• fluorescence

• optical fibers in medical uses

• screen of electronic devices