How do waves move?. Compare solid liquid & gas Solid faster than liquid faster than gas (needs medium) More dense – faster What about light? Fastest in vacuum (no medium) More dense - slower.
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Sounds that are too high in frequency for humans to hear are called ultrasound. Normally, these sounds are above 20,000 Hz.
Sounds that are too low in frequency for humans to hear are called infrasound. Normally, these sounds are below 20 Hz.
Infrasound is sound with a frequency too low to be heard by the human ear. The study of such sound waves covers sounds beneath the lowest limits of human hearing (20 hertz). Many animals, including whales, elephants, rhinoceros, giraffes, okapi, and alligators, communicate using infrasound.Used in movies to give a feeling of unease; can vibrate your whole body
When two or more waves come together, they “superimpose” or add together. The total amplitude is simply the sum (positive & negative!) of all the individual amplitudes. The extremes of what can happen are called constructive interference and destructive interference
waves generated when a series of wave pulses are sent through a medium and then reflected back upon themselves.
Nodes – distructive interference
Antinodes – constructive interference