If a 100-Hz tone had to be increased to 110 Hz for a subject to just notice the difference, you would predict that a 1000-Hz tone would have to be increased to:
Correct answer: D. 1100 to be noticed
- A. 1250 to be noticed
- B. 1200 to be noticed
- C. 1010 to be noticed
- D. 1100 to be noticed
Explanation
Weber’s law predicts a roughly constant proportional difference threshold: a 10% increase from 100 to 110 Hz was needed, so 1000 Hz would require an increase to about 1100 Hz. This is why the answer is d rather than a fixed 10-Hz increase.
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