Weber's law describes how much louder a tone would have to be before you would notice a change. Here option B is correct answer.
Weber's law states that as stimulus size grows, sensitivity to changes in magnitude along a particular physical dimension diminishes. This is a fundamental tenet of perception.
The focus of Weber's law is frequently on stimulus, change, and the likelihood that someone will notice or respond to the change. A person is much more likely to react to a quiet commercial whose volume suddenly doubles than to one whose volume only slightly rises.
According to Weber's Law, the amount of stimulus required to notice a change depends less on the size or intensity of the stimulus change than it does on how proportionate the change is to the original stimulus's intensity.
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