P4.1 Describing Waves P4.2 Sound, Ultrasound and Infrasound P4.3 Wave Speed P4.4 Refraction P4.5 Waves Crossing Boundaries (Triple only) P4.6 Ears and Hearing (Triple only) P4.7 Ultrasound (Triple only) P4.8 Infrasound (Triple only) Skeptic dictionary - Infrasound Video - monitoring volcanos with infrasound Video - Tsunami early warning system News - infrasound used to detect meteors |
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