![]() ![]() Such a device is called a radio receiver or just a radio. They do not have organs for receiving radio waves. Humans and other animals have organs called ears for receiving sound waves. Sound is a longitudinal mechanical wave and radio is a transverse electromagnetic wave.How long is the actual antenna used for ELF communication?.compare to the circumference of the Earth? How does the antenna length you calculated in part c.How long would a dipole antenna have to be to broadcast at this frequency?.Who uses this frequency and for what purpose?.This lies in the extremely low frequency (ELF) part of the radio spectrum. The lowest frequency of electromagnetic radiation used for communication purposes is at 76 Hz.How is the problem of hotspots dealt with in the design of microwave ovens or in the cooking techniques employed by the people that use them?.What is the separation between hotspots in a 2.45 GHz microwave oven?.On what part of a standing wave do the hotspots in a microwave oven form?.Hotspots in a microwave oven are caused by the formation of standing waves within the cooking chamber.What is the wavelength of this radiation?.A typical household microwave oven operates at a frequency of 2.45 GHz.Assume that both types of frequencies are broadcast under identical conditions. Why are TV broadcasts in the very high frequency (VHF) range more easily received in areas of marginal reception than broadcasts in the ultra high frequency (UHF) range? Remember, UHF frequencies are higher than VHF frequencies.How is this possible? Why is it that the light can escape the oven, but the microwaves can't? The perforations allow you to see the food inside while at the same time keeping the microwaves trapped inside. The door on a microwave oven is basically a double layer of safety glass with a perforated metal foil layer in between.What is the source of all electromagnetic waves?.What kind of electromagnetic radiation is this?.What is the frequency of the electromagnetic wave with the wavelength calculated in part d?. ![]() For what wavelength could a picket fence be used like a diffraction grating?.What is the separation between the pickets of a picket fence?.What is the wavelength of the approximate center of the visible spectrum?.What is the separation between the scratches on a diffraction grating that would be used in a typical high school or undergraduate physics lab?. ![]()
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