A wave has a period of 0.020 s and a wavelength of 2.0 m. What is its speed?
Correct answer C. 100 m/s
Explanation
Frequency f = 1/T = 50 Hz, so v = fλ = 50 × 2.0 = 100 m/s, equivalently v = λ/T. Multiplying λ by T gives the wrong value 0.040 m/s.
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