PH-2251

Wave speed

Physics · Secondary 4 · Hard · Wave speed

1. $4.5\times10^{14}\,\text{Hz}$
2. $1.1\times10^{15}\,\text{Hz}$
3. $2.3\times10^{14}\,\text{Hz}$
4. $1.1\times10^{8}\,\text{Hz}$

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