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From crest to crest, trough to trough or rest position to rest position
wavelength
Distance from one crest to the next crest of a wave.
Wave length..
That would depend what information is available. One common equation is: speed = wavelength x frequency. However, in a practical situation, it may be easier to actually measure the wavelength and (for example) the frequency, and then make deductions about the wavelength, than the other way round.
Yes. To be precise, the wavelength is the length of one precise cycle, and one way to measure that is from top to top.
From crest to crest, trough to trough or rest position to rest position
Use a spectrometer to measure the wavelength of the light. There is a direct, but inverse correlation of the wavelength to the temperature.
wavelength
You measure the energy E and divide it into hc. Wavelength w = hc/E = 0.2E-24/Energy.
To measure the speed of a wave, you multiply the frequency by the wavelength.
That will probably vary A LOT, depending on what type of wave you are talking about, and in what range the wavelength is. For example, the ratio between the frequencies - and therefore between the wavelengths - of different electromagnetic waves can be 15 orders of magnitude, or even more - and the techniques used to measure different ranges will certainly not be the same.
Wave length..
Distance from one crest to the next crest of a wave.
divide output by the number of hours worked
use a metre stick
with a scale