wavelength waveÂ·length (wÄv'lÄngkth', -lÄngth') n. Symbol Î» The distance between one peak or crest of a wave of light, heat, or other energy and the next corresponding peak or crest.
Causes: Emphysema: The number one cause of emphysema is smoking. Other contributing factors in its development or exacerbation (increase in severity) include long-term exposure to other lung irritants, such as air pollution, chemical fumes, or dust.
Both emphysema and chronic bronchitis are caused by damage to the lungs and bronchial tubes. When the damage is caused by smoking, symptoms may improve after a smoker quits. Smoking is responsible for the vast majority of cases of emphysema.