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Created page with "==Key Stage 3== ===Meaning=== Ultrasound is sound that has a frequency higher than 20,000Hz. ===About Ultrasound==="
==Key Stage 3==
===Meaning===
[[Ultrasound]] is [[sound]] that has a [[frequency]] higher than 20,000[[Hz]].
===About Ultrasound===
===Meaning===
[[Ultrasound]] is [[sound]] that has a [[frequency]] higher than 20,000[[Hz]].
===About Ultrasound===