PH-2272

Wave speed

Physics · Secondary 4 · Medium · Wave speed

1. $4.0\times10^{-4}\,\text{m}$
2. $2.5\times10^{-3}\,\text{m}$
3. $6.4\times10^{9}\,\text{m}$
4. $4.0\times10^{-10}\,\text{m}$

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