Uhf radio wave - determine frequency

In summary, the shortest distance between positions at which the electric and magnetic fields are zero in a certain UHF radio wave is 0.34m. To determine the frequency of this wave, the equation (3x10^8)/0.34 = 8.8x10^8 was used. Additionally, drawing a simple sine wave and counting the number of wavelengths and t-axis crossings can help understand the relationship between the shortest distance and the wavelength.
  • #1
flynostrich08
20
0

Homework Statement


in a certain uhf radio wave, the shortest distance between postions at which the elctric an magnetic fields are zero is .34m. determine the frequency of this uhf radio wave


The Attempt at a Solution



i basically just divided (3x10^8)/.34 = (8.8x10^8) that is c/d=frequency
can anyone tell me if that is the correct way to approach the problem? thanks
 
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  • #2


How is the "shortest distance between postions at which the elctric an magnetic fields are zero" related to the wavelength?
 
  • #3


i don't know
 
  • #4


flynostrich08 said:
i don't know
You might want to start by sketching a simple sine wave on a piece of paper. Let y be the vertical axis and t be the horizontal axis.

y = Asin(2πt)

Plot the sine wave for a few periods. Make sure to count how many wavelengths you have drawn. Then count how many times the sine wave crosses the t axis. Compare the two.
 
  • #5


Yes, your approach is correct. The frequency of the UHF radio wave can be determined by dividing the speed of light (3x10^8 m/s) by the shortest distance between positions where the electric and magnetic fields are zero (.34m). This gives a frequency of approximately 8.8x10^8 Hz. Great job!
 

FAQ: Uhf radio wave - determine frequency

What is an UHF radio wave?

An UHF (Ultra-High Frequency) radio wave is an electromagnetic wave with a frequency range of 300 MHz to 3 GHz. It is commonly used for communication purposes, such as in television and radio broadcasting, mobile phones, and two-way radios.

How is the frequency of an UHF radio wave determined?

The frequency of an UHF radio wave can be determined by measuring the number of oscillations or cycles it completes in one second. This is usually measured in Hertz (Hz), where one Hz is equal to one cycle per second.

What factors affect the frequency of an UHF radio wave?

The frequency of an UHF radio wave can be affected by various factors, including the length of the antenna, the type of modulation used, and any interference or obstacles in the transmission path. It can also be affected by the physical properties of the medium through which it is traveling, such as air or water.

Why is UHF radio wave used for certain applications?

UHF radio waves are commonly used for applications that require high-frequency signals, such as in satellite communication, radar systems, and wireless data transmission. This is because UHF waves have a shorter wavelength, allowing for more precise and efficient communication over shorter distances.

How does the frequency of an UHF radio wave impact its range?

The frequency of an UHF radio wave can impact its range by affecting its ability to penetrate through obstacles and travel longer distances. Higher frequencies tend to have shorter ranges as they are more easily absorbed or reflected by objects in their path, while lower frequencies can travel longer distances but with less clarity and accuracy.

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