alleryHow does the Newton formula result for the speed of sound in air compare with experiment?
AAbout fifty per cent greater
BAbout fifteen per cent smaller
CAbout fifteen per cent greater
DAbout fifty per cent smaller
Answer & Solution
Correct answer: B. About fifteen per cent smaller
1. The Newton formula assumes an isothermal compression.
2. That assumption gives 280 metres per second at standard conditions.
3. The experimental value is 331 metres per second.
4. The formula result is about 15 per cent smaller than the experimental value.
_Source: syllabus Physics Part II, Ch 14 'Waves'_
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