The letter λ (lambda) designates the wavelength of any given radiation. This size can be measured, it is possible to calculate theoretically and if radiation is visible, then even to measure by eye.
Instruction
1. To calculate radiation wavelength, knowing the frequency and speed of distribution of this radiation, divide the second size into the first. If instead of frequency the period is known, increase it by the speed of distribution of radiation. At last, if the cyclic frequency of radiation is known, increase speed on 2π, and then divide result into cyclic frequency. That the result turned out in the SI system, previously transfer to it all sizes from a statement of the problem. Then transfer result back to units, convenient for you.
2. If radiation is light, measure length of its wave in a vacuum by eye: red - from 635 to 690 nanometers, orange - 590, yellow - from 570 to 580, green - from 510 to 520, blue - from 440 to 480, violet - from 380 to 400.
3. Having the special device - a spectrometer, it is possible to determine light wavelength more precisely, than approximately. If it is polychromatic, it is possible to determine its spectral structure only by this device for this purpose send a light stream to an entrance window of the device. It will pass through the crack perpendicular to a prism, and then and through a prism, and then will get either on a scale, or on a line of sensors. In the second case, processing of result of measurement will be carried out by the electronic block of the device.
4. For finding of wavelength of radiation of decimeter or centimetric range connect the antenna to a wavemeter then begin to change its size smoothly. When it becomes equal to a half of wavelength, indications of a wavemeter will be maximum.
5. Direct a thin ray of light strictly perpendicular to a diffraction lattice. On the screen a number of spots will appear. Measure a corner between the imagined line continuing the beam course after a lattice, the line connecting a beam entry point in a lattice to the first of spots. Find a sine of this corner, and then increase by distance between two neighboring lines of a lattice. Wavelength which will be expressed in the same units, as distance between lines will turn out.