It is also the time taken for one whole wave to pass a point ... all of the electromagnetic spectrum in a vacuum is 300,000,000 m/s or 3×10 8 m/s the speed of sound in air is often taken to ...
Ultrasound waves are longitudinal waves just like sound waves, and they cannot pass through a vacuum. Ultrasound waves have a frequency above 20 000 Hz, other than that they are like sound waves ...
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