Damage may be a result of the direct effects of alcohol on the brain or may result indirectly, from a poor general health status or from severe liver disease. For example, thiamine deficiency is a common occurrence in people with alcoholism and results from poor overall nutrition.
In the case of a longitudinal wave, a wavelength measurement is made by measuring the distance from a compression to the next compression or from a rarefaction to the next rarefaction. On the diagram above, the distance from point A to point C or from point B to point D would be representative of the wavelength.
If the pattern is viewed on a screen a distance L from the slits, then the wavelength can be found from the spacing of the fringes. We have Î» = w sinÎ¸/m and sinÎ¸ = z/(L2 + z2)1/2), or. Î» = zw/(m(L2 + z2)1/2), where z is the distance from the center of the interference pattern to the mth dark line in the pattern.