alleryStart learning →A sound of frequency 850 Hz travels through air at 340 m/s. What is its wavelength?
A0.400 m
B2.50 m
C289 m
D1.19 m
Answer & Solution
Correct answer: A. 0.400 m
1. Wave speed, frequency and wavelength are linked by v_w = f x wavelength.
2. Rearranging gives wavelength = v_w / f.
3. Substitute: wavelength = 340 m/s divided by 850 Hz.
4. wavelength = 0.400 m.
5. Multiplying speed by frequency instead of dividing gives 289000, which is not a length at all.
_Source: OpenStax College Physics (CC BY 4.0), Ch 16 "Oscillatory Motion and Waves", section 16.9 Waves_
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