PH-788

Echoes and ultrasound

Physics · Secondary 3 · Medium · Echoes and ultrasound

1. $3.4 \times 10^{2}\,\text{m s}^{-1}$
2. $1.7 \times 10^{2}\,\text{m s}^{-1}$
3. $6.0 \times 10^{1}\,\text{m s}^{-1}$
4. $1.2 \times 10^{3}\,\text{m s}^{-1}$

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