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Worksheet: Electromagnetic Waves for Communication

Q1:

Which of the following statements is not a reason why when visible light is used for communications it must be transmitted through fiber cables rather than through the atmosphere?

  • AVisible light does not reflect from the ionosphere.
  • BVisible light is strongly absorbed by Earth’s atmosphere.
  • CVery bright visible light broadcasts would dazzle people and animals.
  • DVisible light travels faster through fiber cables than through Earth’s atmosphere.

Q2:

Which of the following statements most correctly describes how short-wave radio signals propagate?

  • AShort-wave radio signals only travel directly from transmitters to receivers.
  • BShort-wave radio signals diffract through Earth’s atmosphere.
  • CShort-wave radio signals are transmitted to and from satellites.
  • DShort-wave radio signals reflect from the ionosphere and Earth’s surface.

Q3:

Different types of long-wavelength electromagnetic waves, A, B, and C, all used for long distance communication, are shown in the diagram.

Which of the types A, B, and C shows microwaves?

  • A Type C
  • B Type A
  • CNone of them shows microwaves.
  • D Type B

Which of the types A, B, and C shows long-wave radio waves?

  • ANone of them shows long-wave radio waves.
  • B Type B
  • C Type A
  • D Type C

Which of the types A, B, and C shows short-wave radio waves?

  • A Type A
  • B Type B
  • C Type C
  • DNone of them shows short-wave radio waves.

Q4:

Which of the following types of electromagnetic waves is not used for sending communication signals?

  • AMicrowaves
  • BRadio waves
  • CVisible light waves
  • DUltraviolet waves
  • EInfrared waves

Q5:

Which of the following statements most correctly describes how long-wave radio signals propagate?

  • ALong-wave radio signals reflect from the ionosphere and Earth’s surface.
  • BLong-wave radio signals only travel directly from transmitters to receivers.
  • CLong-wave radio signals are transmitted to and from satellites.
  • DLong-wave radio signals diffract through Earth’s atmosphere.

Q6:

Which of the following is a correct description of the ionosphere?

  • AA type of electrically charged particle that emits radio waves
  • BAn electrically charged layer in Earth’s lower atmosphere
  • CA type of electrically charged particle that absorbs radio waves
  • DAn electrically charged layer in Earth’s upper atmosphere
  • EA circular radio antenna

Q7:

Which of the following statements most correctly describes how FM radio signals propagate?

  • AFM radio signals diffract through Earth’s atmosphere.
  • BFM radio signals reflect from the ionosphere and Earth’s surface.
  • CFM radio signals are transmitted to and from satellites.
  • DFM radio signals only travel directly from transmitters to receivers.

Q8:

The diagram shows how radio waves are generated, transmitted, and received.

Which of the objects shown in the diagram is generating a radio wave?

  • AObject (A)
  • BObject (B)

What type of electric current is required to produce radio waves?

  • AAlternating current
  • BDirect current

Q9:

Which of the following statements most correctly describes how microwave communication signals propagate?

  • AMicrowave communication signals reflect from the ionosphere and Earth’s surface.
  • BMicrowave communication signals only travel directly from transmitters to receivers.
  • CMicrowave communication signals diffract through Earth’s atmosphere.
  • DMicrowave communication signals are transmitted to and from satellites.