PH-2234

Echoes and ultrasound

Physics · Secondary 4 · Medium · Echoes and ultrasound

1. $1.0 \times 10^{-5}\,\text{s}$
2. $2.5 \times 10^{-6}\,\text{s}$
3. $5.0 \times 10^{-6}\,\text{s}$
4. $1.0 \times 10^{-4}\,\text{s}$

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