<prompt> Weber Fechner Law isMagnitude of stimulus strength perceived is approximately propoionate to the log of the intensity of stimulus strengthMagnitude of stimulus strength perceived is directly propoional to the intensity of stimulus strengthThreshold of receptor is directly propoional to stimulus strengthThreshold of receptor is inversely propoional to stimulus strength  <response>: The magnitude of the sensation felt is propoional to the log of the intensity of the stimulus Weber-Fechner law . It now appears, however, that a power function more accurately describes this relation. In other words, R KSA where R is the sensation felt, S is the intensity of the stimulus, and, for any specific sensory modality, K and A are constants. P K lnSS0 REF: Ganongs review of medical physiology 23rd Edition page no.153 