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Lesson 6 - Frequency and Wavelength
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Objective
In this lesson students carry quantitative investigations of sound to determine the relationship between a waves frequency f, wavelength l and velocity v. Students will plan, design and perform the investigation and will be given homework involving calculations and problem solving.
Prescribed Focus Area Skills Development Content

P2 A student applies the processes that are used to test and validate models, theories and laws of science with particular emphasis on first-hand investigations in physics

P11.1 Students identify data sources
P11.2 … plan first-hand investigations
P11.3 … choose equipment and resources
P12.1 … perform first-hand investigations
P12.2 … gather first-hand information
P12.4 … process information
P14 … draw valid conclusions from gathered data and information

D1.6 Students learn to quantify the relationship between velocity, frequency and wavelength for a wave:    v = fl

Activity Resources Homework

A1.5 Plan, choose equipment for and perform a first-hand investigation to gather information to identify the relationship between the frequency and wavelength of a sound wave travelling at a constant velocity.

  • A variety of sound sources including tuning forks, bells, guitar etc.
  • Microphone & amplifier
  • Oscilloscope
A1.6 Students solve problems and analyse information by applying the mathematical model of  v = fl to a range of situations.
Management issues Nominal duration
This lesson involves a large piece of work for the students and would most probably be done in small groups. The nominal division of time might involve 1 hour devoted to planning, 1 hour to conduct the investigation and a further hour to do the analysis and write up the results.
3 hours

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