某波的頻率為 440 Hz，波長為 0.75 m，求波速。
Answer and explanation
Correct answer: C. 330 m/s
- Step 1: 波速 m/s。
- Step 2: 單位檢查：Hz m m/s。
Answer
330 m/s.
Why not the others: 586.667 m/s：用了 ；440.75 m/s：把頻率與波長相加；660 m/s：多乘了 2。
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