Exploration of Electromagnetic Waves with Investigative and Inquiry-Based Activities

Year 2018, Volume: 10 , 130 - 136, 12.09.2018

Ayse Oguz Unver Naz Fulya Ozkarabacak

Abstract

Electromagnetic waves have been
mathematically described by James Clerk Maxwell for the first time after many
years of scientists’ struggle to understand the world and the universe.
Considering widespread use of technological devices emitting electromagnetic
waves, their possible environmental and health effects, their role in rapidly
advancing energy sector; electromagnetic waves have been a matter of curiosity amongst
people. The reason of this curiosity is that electromagnetic waves do not fall
directly into human observation range. The purpose of this study was using
investigative and inquiry-based activities to make unobservable electromagnetic
waves sensible and visible. In this context, 10 sequential demonstration
activities were implemented to 46 teacher candidates continuing their education
in third grade of science teacher education department. They were asked to note
their predictions, observations and inferences down on the worksheets.
Participants were surprised when a radio placed into a trashcan stopped playing
music or a phone covered with aluminum foil did not receive calls since their
observations contradicted with their common experiences. Bachelard defined this
phenomenon as ‘’scientific discontinuity’’. Even after weeks, participants
tried to come up with explanations regarding their observations since their
sense of curiosity was aroused and they had an irresistible desire for
exploration. Classroom discussions were video recorded for detailed analysis.
As intended; with the sequential activities, exploration of electromagnetic
waves occurred at the end. In addition, with the light of inquiry, participants
started thinking scientifically considering science as a part of their lives
and a solution of problems. According to the results, it was determined that
participants generally confused electromagnetic waves with sound waves, signal,
power of attraction, frequency concepts. Recognition of some variables,
comparisons between radio and microwaves by participants were observed.
Interpretation of the data showed that participants generally had
misconceptions and lack of knowledge regarding electromagnetic waves.

Keywords

Electromagnetic waves, Radio waves, Microwaves, science education, Electromagnetic wave theory

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