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: Use the standard wave speed formula .
- Step 2: Setting and , we get .
- Step 3: The calculated speed is .
Answer
200.
Why not the others: '54' adds frequency and wavelength () instead of multiplying; '400' multiplies by an extra factor of ; '25/2' divides frequency by wavelength () instead of multiplying.
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