PH-2233

Echoes and ultrasound

Physics · Secondary 4 · Medium · Echoes and ultrasound

1. $2.5 \times 10^{-3}\,\text{m}$
2. $4.0 \times 10^{-4}\,\text{m}$
3. $2.0 \times 10^{-2}\,\text{m}$
4. $4.0 \times 10^{-3}\,\text{m}$

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