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Identify the main features of a transverse wave:
- trough and crest;
- amplitude;
- wavelength.
Recognise that all electromagnetic waves travel at the same high speed in space.
Describe how, historically, the use of light greatly increased the speed of communication but that it requires the use of a code.
Recall that a laser produces a narrow intense beam of light.
Describe the main features of a transverse wave:
- trough and crest;
- amplitude;
- wavelength;
- frequency as the number of waves in each second.
State and use the equation:
wave speed = frequency x wavelength.
Describe how light was used as a means of communication: Morse code.
State and use the equation:
wave speed = frequency x wavelength. (A change of subject may be required).
Explain the advantages and disadvantages of using light, radio and electrical signals for communication.
Explain that a laser produces an intense beam of light in which all of the waves are:
- the same frequency;
- in phase with each other.
Explain how a laser beam is used in a CD player by reflection from the shiny surface:
- surface contains digital information;
- information in the form of a patterns of pits.
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Homework1
Lesson ID:
Starters:
Objectives:
Prior Learning:
Difficult Concepts:
Outline:
Suggested Practicals:
Extension Activities:
Homework:
Homework2