Chapter 15 Practice Questions

What type of signal [cell phone, TV, FM, AM] has the longest wavelength?

AM

What is the order of waves from lowest to highest frequency?

Radio waves, microwaves(a type of radio wave), infrared waves, visible light, ultraviolet waves, x rays, gamma rays

Television video signals are sent by ______ modulation.

amplitude

What is changed/modulated in an AM radio wave?

amplitude

Would the color blue or red have the shorter wavelength?

blue

A radio station broadcasts radio waves called_______, which have a specific frequency assigned to the station.

carrier waves

The image on an old television screen is produced by a_______.

cathode-ray tube

As the frequency of an electromagnetic wave decreases, its energy______.

decreases

What are gamma rays used for?

destroying harmful cells

Transverse waves that are produced by vibrating electric charges and consist of vibrating electric and magnetic fields are______.

electromagnetic waves

Electromagnetic waves carry______.

energy

What is ultraviolet light used in?

florescent materials

Which type of electromagnetic wave is the most energetic?

gamma rays

FM radio wave frequencies are_______than AM waves.

higher than

As the wavelength of an electromagnetic wave decreases, its frequency______.

increases

A remote control uses_______to communicate with the television set.

infrared waves

What are x rays used in?

medical imaging (bones, teeth, organs, etc...)

When gamma rays pass through living tissue they damage______.

molecules

To track a hurricane, meteorologists use_______.

radar

Electromagnetic waves transmit________.

radiant energy

Cell phones use______waves to transmit information.

radio

What type of electromagnetic wave has wavelengths greater than 1 mm?

radio waves

_______ are the type of electromagnetic waves often used for communication.

radio waves

What are radio waves used in?

radio, tv transmission

What are infrared waves used in?

remote controls

How would you describe x rays in terms of wavelength and frequency?

short wavelength, high frequency

What is the unit of radiant energy?

the electron

The ozone layer protects us from too much _____ radiation.

ultraviolet

If you stay outdoors too long, your skin might be burned by exposure to_______from the sun.

ultraviolet waves

Which type of electromagnetic wave enables skin cells to produce vitamin D?

ultraviolet waves

What is visible light used for?

vision

Each color of visible light has a different______.

wavelength