How to find the wavelength?

Vladimir Kulinich
Vladimir Kulinich
February 19, 2013
How to find the wavelength?

When calculating and designing television radio receivers and transmitters, medical and optical equipment, navigation aids, as well as in other branches of engineering and science, it becomes necessary to calculate the wavelength.

The wavelength is the distance between two points (any) that oscillate in phase, but usually the notion of "wavelength" is taken as the distance between the crests of this wave. Measured wavelength in units of distance, for example, in meters. On the question of how to find the wavelength, our article will answer.

The wavelength is inversely proportional to the frequency of the wave. We know that the unit of frequency is hertz (Hz). For example, the current frequency of home electrical networks in Russia is 50 Hz. But for the transmission of radio signals and television signals using a higher frequency.

Determination of wavelength

For example, you know that some radio station operates at a frequency of 1.7 MHz, and the scale of the radio receiver that you have is calibrated in meters. You need to find a wave on which you will listen to this radio station.In order to answer the question of how to determine the wavelength, you first need to remember what the abbreviations of some values ​​are equal to:

  • "K" - "kilo", 103 = 1000
  • “M” - “mega”, 106 = 1,000,000

1. It is necessary to convert MHz to Hz. We get - 1.7 MHz = 1700000 Hz;

2. The wavelength can be found by the formula:

  • λ = c / v, where c is the speed of light, v is the radiation frequency.

The speed of light in vacuum is almost equal to the speed of light in air. Electromagnetic waves and radio waves, X-rays propagate at the speed of light. So, the length of a 1.7 MHz radio wave is equal to:

300000000 / 1700000≈176.47m.

What are the wavelengths

The shorter the wavelength, the higher its frequency and vice versa, therefore, they distinguish:

  • long waves (DW), which lie in the range of 1000m-10000m
  • medium waves (SV), which lie in the range of 100m-1000m
  • short (KV), which lie in the range of 10m-100m
  • ultrashort (VHF), which lie in the range of 10-6m-10m

Long waves can propagate up to 2000km, because they are reflected from the surface of the earth.

Medium waves dampens the surface of the planet. The range of propagation of such waves depends on the time of day.

Short waves travel vast distances, alternating from the ionosphere and from the earth.

With the propagation of waves in different environments, their length may vary, while the frequency will remain the same. It depends on the properties of the propagation medium.

Now you know how to calculate the wavelength!

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