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# Act_2 - Name Section Activity 2 Electromagnetic Waves...

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12/29/04 1 Name _________________________ Section ___________________ Activity 2: Electromagnetic Waves – Radiant Energy I 2.1 How Do Electromagnetic Waves and Other Waves Transmit Energy? Your instructor will discuss the properties of waves. 1) Transferring energy with waves a) Stretch a slinky along the length of your table with a student holding each end. Vibrate one end of the slinky to send sine waves along it. What can you do to increase the frequency of the waves? b) What does increasing the frequency of the waves do to the wavelength? c) Place a Styrofoam ball near the slinky. Send one pulse wave along the slinky to knock the ball off of the table. Is it possible to transfer energy without a transfer of matter? d) Group Discussion Question: List examples of transfer of energy without a transfer of matter. 2) Wave Speed and Frequency Your instructor will discuss wave periods and frequencies. Use this information to find the speed of the wave illustrated in the diagrams below. a) Find the wavelength (in meters) of the wave in the diagram. 3 cm = 0.03 m Distance (in cm) Displacement 1 2 3 4 5 6 10 9 8 7

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12/29/04 2 b) The diagram below shows the displacement of a wave over time, at a fixed point along the path of the wave. Find the period of the wave in the diagram. _ ____________ c) Calculate the frequency of the wave (in cycles/second, or Hertz).
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