Certified Safety Professional Practice Exam

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Which factor influences the speed or velocity of sound?

Medium density

The speed or velocity of sound is influenced by the density of the medium through which it travels. In general, sound travels faster in denser mediums because the particles are closer together, allowing sound waves to be transmitted more efficiently. For instance, in solids, where the atoms are tightly packed, sound travels at a much higher speed than in gases, where the particles are more spread out.

While other factors like temperature, air pressure, and humidity can affect the speed of sound to some extent, they do so indirectly and are often less significant than the inherent density of the medium. For example, temperature primarily affects the speed of sound in gases, where an increase in temperature leads to increased energy in the particles, causing them to vibrate more quickly and transmit sound faster. However, density remains a fundamental factor because it directly affects how tightly packed the particles are, thus influencing the transmission speed of the sound waves.

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Air pressure

Temperature

Humidity

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