Nietkalieva Dinara IS113k
Lab 1: Radio and Light Waves Virtual Lab
1) How is the radiating electric field (or electromagnetic signal) produced when radio stations broadcast? Include a description of what is producing the signal as well as the reasoning behind how this could produce a signal. We know that electromagnetic radiation is produced by accelerating charges. In the radio transmitter, electrons oscillate up and down and are thus accelerating. An electron will exert a force on another electron when they are some distance away, like charges repel. When the electron in the transmitter oscillates up and down, the direction of the force it exerts changes since the source of the force is moving. It takes some time for the change in this direction of the force to be felt since this change is communicated or propagated out at the speed of light. In addition, the horizontal component of this force is canceled by the positive charges in the transmitting antenna. So, the resulting force is an oscillating force that pushes vertically on electrons. This force propagates out as a wave as the signal travels at the speed of light. 2) How does your antenna work to detect this electromagnetic signal produced when radio stations broadcast? Include the physics principles that support your description of how this signal is detected. Antenna works as receiver. The receiver is a nearby loop of wire containing a second spark gap. Such a receiver loop, placed several meters from the transmitter, has its own effective inductance, capacitance, and natural frequency of oscillation. When transmitter creates electric signal using spark gap with it gains frequency. Sparks were induced across the gap of the receiving electrodes when the receiver’s frequency was adjusted to match that of the transmitter.
3) What does the curve represent?
The intensity and direction of the force that would be exerted by the electromagnetic wave on an electron. 4) With the frequency...
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