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.
Usually , in transverse waves ( waves with points oscillating at right angles to the direction of their advance ) , wavelength is measured from crest to crest or from trough to trough ; in longitudinal waves ( waves with points vibrating in the same direction as their advance ) , it is measured from compression to compression or from rarefaction to ...