ALEX Classroom Resource

  

How Is a Radio Wave Emitted?

  Classroom Resource Information  

Title:

How Is a Radio Wave Emitted?

URL:

https://aptv.pbslearningmedia.org/resource/phy03.sci.phys.energy.radiowv/how-is-a-radio-wave-emitted/

Content Source:

PBS
Type: Informational Material

Overview:

The sound produced for a radio broadcast may take three different forms and travel dozens of miles before it comes out of your loudspeaker. This illustrated essay from A Science Odyssey Web site explains the conversion of electrical signals to radio waves.

Content Standard(s):
Science
SC2015 (2015)
Grade: 8
Physical Science
19 ) Integrate qualitative information to explain that common communication devices (e.g., cellular telephones, radios, remote controls, Wi-Fi components, global positioning systems [GPS], wireless technology components) use electromagnetic waves to encode and transmit information.

Unpacked Content
Scientific And Engineering Practices:
Obtaining, Evaluating, and Communicating Information
Crosscutting Concepts: Structure and Function
Disciplinary Core Idea: Waves and Their Applications in Technologies for Information Transfer
Evidence Of Student Attainment:
Students:
  • Use qualitative information to explain how communication devices use electromagnetic waves to encode information.
  • Use qualitative information to explain how communication devices use electromagnetic waves to transmit information.
Teacher Vocabulary:
  • Qualitative
  • Information
  • Communication devices (e.g., cellular phone, Global Positioning System (GPS), remote control, Wi-Fi, etc.)
  • Electromagnetic waves
  • Energy
  • Energy wave
  • Electric field
  • Magnet
  • Magnetic field
  • Mechanical wave
  • Vacuum
  • Frequency
  • Wavelength
  • Crest
  • Medium
  • Amplitude
  • Displacement
  • Rest position
  • Encode
  • Transmit
Knowledge:
Students know:
  • Electromagnetic waves are a form of energy waves that have both an electric and magnetic field. Electromagnetic waves are different from mechanical waves in that they can transmit energy and travel through a vacuum.
  • The different types of electromagnetic waves have different uses and functions in our everyday lives.
  • Electromagnetic waves differ from each other in wavelength, frequency, and energy, and are classified accordingly. Wavelength is the distance between one wave crest to the next.
  • Frequency refers to how often the particles of the medium vibrate when a wave passes through the medium
  • The amount of energy carried by a wave is related to the amplitude of the wave. A high energy wave is characterized by a high amplitude; a low energy wave is characterized by a low amplitude. The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position.
  • Electromagnetic waves can be used to encode information.
  • Electromagnetic waves can be used to transmit information.
  • Examples of common communication devices may include cellular telephones, radios, remote controls, Wi-Fi components, global positioning systems (GPS), and wireless technology components.
Skills:
Students are able to:
  • Gather evidence sufficient to explain a phenomenon that includes the idea that using waves to carry digital signals is a more reliable way to encode and transmit information than using waves to carry analog signals.
  • Combine the relevant information (from multiple sources) to articulate the explanation.
Understanding:
Students understand that:
  • Common communication devices use electromagnetic waves to encode and transmit information.
AMSTI Resources:
AMSTI Module:
Electricity, Waves, and Information Transfer

Alabama Alternate Achievement Standards
AAS Standard:
SCI.AAS.8.19- Recognize that common communication devices use electromagnetic waves to transmit information, and that these electromagnetic waves are invisible to the human eye.


Tags: electrical signal, electromagnetic, radio, wave
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Comments

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  This resource provided by:  
Author: Stephanie Carver