Sound cannot travel through

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ScienceOne small aha

Your new ahaA vacuum

A vacuum contains less matter than ordinary surroundings. Source: Vacuum ↗

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35Particle of lightRECALL
Photon
A quantum of electromagnetic radiation
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36This quantity counts complete wave cycles per second.RECALL
Frequency
Measured in hertz
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37This quantity is the time taken for one complete wave cycle.RECALL
Period
It is the reciprocal of frequency
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