A sound wave in air has a frequency of 680 Hz. If the speed of sound in air is 340 m/s, what is its wavelength?
Answer and explanation
Correct answer: B. 0.50 meters
- Step 1: Use the wave speed relationship: v = f * lambda.
- Step 2: Rearranging gives lambda = v / f = 340 m/s / 680 Hz = 0.50 m.
Answer
0.50 meters.
Why not the others: '2.0 meters' inverts the equation dividing frequency by speed (680/340); '1,020 meters' adds speed and frequency; '0.25 meters' divides by 2 twice.
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