Electromagnetic Waves 09

If you stay outside for too long, your skin might be burned by exposure to................from the sun.

• Visible light

• Ultraviolet light

• Infrared

• x-rays

Which of the following describes X-rays?

• short wavelength, high frequency

• short wavelength, low frequency

• long wavelength, high frequency

• long wavelength, low frequency

Electromagnetic waves can behave like particles called

• Molecules

• electrons

• photons

• atoms

Which of these colors of visible light has the shortest wavelength?

• Violet

• Yellow

• Red

• Green

Which term refers to the energy carried by an electromagnetic wave?

• kinetic energy

• potential energy

• radiant energy

• nuclear energy

The frequency of an electromagnetic wave has which unit?

• Newtons

• Hertz

• Nanometers

• meters/second

The warmth you feel from a fire is thermal(heat) energy transmitted to you by which type of electromagnetic wave?

• X-rays

• Microwaves

• Infrared waves

• Ultraviolet waves

Mechanical waves are different from electromagnetic waves because

• EM waves have a constant speed

• EM waves have different speeds

• Mechanical waves are only longitudinal

• Mechanical waves are only transverse

Airport screening devices to examine the contents of a luggage uses these waves

• Microwaves

• X-rays

• Infrared waves

• Visible light

Radio waves can carry audio signals from a radio station but radio waves cannot be heard. When can they be heard?

• When sound is not too strong to weaken the radio waves

• When the radio changes radio waves to sound waves.

• When the radio waves use air as a medium to travel

• When the radio changes sound waves to radio waves