Electromagnetic Waves

Which electromagnetic wave has the shortest wavelength and hence the highest frequency?

What is a form of electromagnetic wave that can travel through a vacuum (i.e in space?)

• Sound wave

• Light wave

• Water wave

• Compressional wave

What is the speed of an electromagnetic wave in a vacuum?

• 330 m/s

• 3x 10⁸ m/s

• 6.02 x 10 ²³ m/s

• 5 x 10 ^-7 m/s

What type of electromagnetic radiation is used in military night vision goggles?

What type of EM radiation plays an important role in wireless communication?

• ultraviolet

• visible light

• infrared

• microwave

What are X - Rays used for?

• Scanning luggage during security checks.

• Checking for broken bones.

• Checking to see if your shoelaces are untied.

• Sterilising hospital equipment.

What does the picture below illustrate?

• Visible Light Spectrum

• Electromagnetic Spectrum

• Frequency Indicator

• Color Line

Which electromagnetic waves are used in devices such as heat lamps & TV remote controls?

• ultraviolet rays
• microwaves
• infrared rays

Which of the following lists the electromagnetic waves in order of decreasing frequency?

• X-rays, microwaves, infrared rays
• UV rays, visible light, x-rays
• infrared rays, microwaves, radio waves

Radar uses which type of electromagnetic waves to detect objects & measure their distance and speed?

• microwaves
• infrared rays
• x-rays