A wave has a frequency of and a wavelength of . What is its speed (in m/s)?
Answer and explanation
Correct answer: B. 200
- Step 1: Propagation speed of a periodic wave is related to frequency and wavelength by .
- Step 2: Substitute frequency and wavelength : .
- Step 3: Multiplying gives a wave speed of .
Answer
200.
Why not the others: 25/2 divides frequency by wavelength (); 54 adds frequency and wavelength; 400 doubles the product.
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