alleryA wave has speed 340 m/s and frequency 850 Hz. Its wavelength is
A0.25 m
B0.40 m
C2.5 m
D4.0 m
Answer & Solution
Correct answer: B. 0.40 m
1. Wave equation: v = f × λ, where f is frequency and λ is wavelength.
2. Rearrange: λ = v / f.
3. λ = 340 / 850 = 0.40 m.
4. This is a typical wavelength for sound in air at 850 Hz.
_Source: syllabus Physics, Ch 14 "Waves", §14.4_
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