A sound wave of frequency 500 Hz has a wavelength of 0.68 m in air. What is its speed?
Correct answer D. 340 m/s
Explanation
Using v = fλ, v = 500 × 0.68 = 340 m/s. Dividing wavelength by frequency instead gives the meaningless value 1.4 × 10⁻³ m/s.
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