PH-2246

Wave speed

Physics · Secondary 4 · Hard · Wave speed

1. $0.67\,\text{m s}^{-1}$
2. $1.5\,\text{m s}^{-1}$
3. $2.0\,\text{m s}^{-1}$
4. $24\,\text{m s}^{-1}$

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