Radio Waves and Electromagnetic Fields

1899 words 8 pages
PHY112 – Lab 9 – Worksheet
•When you go to the simulation you will have a choice to either run the simulation or download the simulation. Run may not work on all computers. If it does not run, download the simulation and work from there.
•When the simulation opens, play with the controls and buttons to become familiar with how the simulation works.
•Note: A formal lab report is not required for this activity. You may cut and paste this worksheet to a new Word document and adjust the spacing to fit your needs.
•Open the simulation.
•Explain how the radiating electric field (or electromagnetic signal) is produced when radio stations broadcast.
A radio wave (radiating electric field) propagates out from the
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When amplitude of the transmitting electron increases, larger acceleration is experienced by the electron in the transmitting antenna. The magnitude/ strength of the force on the electron produced is, therefore, larger. The force on the electron results from the strength of the electromagnetic wave. The frequency of the wave determined the speed that the electron oscillates.
True or False: If the frequency of the transmitting electron decreases by a factor of 2, it will now take longer for the electromagnetic signal to reach the receiving antenna.
False: the speed of light is constant, which is the sped at which electromagnetic waves travel.
True or False: If the frequency decreases, the wavelength decreases.
False: If the frequency decreases , the wavelength would increase. This is easily seen, as wavelength and frequency are related by the following: frequency x wavelength = speed of light. meaning, wavelength = speed of light / frequency.
True or False: The electromagnetic waves generated by the transmitting antenna produce currents in the receiving antenna.
True: electrons in the receiver move up and down, responding to the forces put on them by electromagnetic waves. This results in current being detected in the receiver (a current consists, after all, of moving charges).
True or False: When the electron in the transmitting antenna is at its peak height, the electron in the receiving antenna is always also at its peak height.


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