Chapter 11 Electromagnetic Waves

A(n) _________ transmits a radio signal at one frequency and receives radio signals at a different frequency.

• 1. carrier wave

• 1. microwave oven

• transceiver

• X-ray machine

Electromagnetic waves are made by ________.

• 1. vibrating water molecules

  
  

• 1. vibrating electric charges

  
  

• 2. vibrating air molecules

  
  

• 2. strong compressions

Which of the following electromagnetic waves can travel through matter and cause damage to cells?

• 1. radio waves

  
  

• microwaves

• 1. infrared waves

  
  

• 1. gamma rays

  
  

Communications satellites use microwaves instead of radio waves because _______.

• microwaves are cheaper than radio waves

• microwaves travel faster than radio waves

• radio waves cannot travel in space

• microwaves travel more easily through the atmosphere than radio waves

The entire range of the electromagnetic wave frequencies is known as _______.

1. 
   

• 1. ultraviolet radiation

  
  

• 1. visible light

  
  

• 1. the electromagnetic spectrum

  
  

• magnetism

Whether or not electrons will be ejected from metal when light shines on the metal depends on ________.

1. 
   

• 1. the frequency of the light

  
  

• 1. the intensity of the light

  
  

• whether there were any electrons in the metal

• the temperature of the metal

Television stations broadcast which type of signal?

• 1. analog signal

  
  

• 1. ultraviolet ray

  
  

• 1. gamma ray

  
  

• 1. digital signal

  
  

Radar uses ________ to track airplanes and ships.

1. 
   

• 1. X-rays

  
  

• 1. gamma rays

  
  

• 1. infrared waves

  
  

• 1. radio waves

  
  

Which of the following electromagnetic waves enables your body to make vitamin D?

• 1. visible light

  
  

• 1. ultraviolet waves

  
  

• 1. gamma rays

  
  

• 1. infrared waves

  
  

The Global Positioning System is a system of satellites, ground monitoring stations and receivers that _________.

1. 
   

• 1. provide two-way radio service for police cars, fire trucks, and ambulances

• 1. broadcast television signals

  
  

• 1. provide information about the receiver's exact location at or above Earth's surface

• 1. provide mobile telephone service