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The volume of a sound is determined by its intensity. Intensity is a measure of how much energy is carried by the wave. Sound waves with more energy are louder than sound waves with less energy.
Question 11
How does the volume of a 40 dB sound compare to that of a 20 dB sound?
(A) It is twice as loud.
(B) It is ten times as loud.
(C) It is twenty times as loud.
(D) It is one hundred times as loud. ←
Decibels work on a logarithmic scale, and each increase of 10 dB corresponds to a sound ten times louder.
Sound volume refers to the perceived loudness of a sound. It is a subjective measurement that varies from person to person and depends on a number of factors, including the frequency, duration, and intensity of the sound, as well as the listener's hearing sensitivity and prior exposure to similar sounds.
In acoustics, the physical measurement of sound volume is typically referred to as sound pressure level (SPL), which is measured in decibels (dB). SPL is a logarithmic scale that expresses the ratio of the sound pressure of a sound wave relative to a reference pressure, typically 20 micropascals (µPa) in air.
For example, a sound with an SPL of 60 dB is 10 times more intense than a sound with an SPL of 50 dB, and a sound with an SPL of 70 dB is 100 times more intense than a sound with an SPL of 50 dB.
It's important to note that sound volume can have both positive and negative effects on health, and prolonged exposure to loud sounds can cause hearing damage. To protect hearing, it is recommended to limit exposure to sounds with an SPL above 85 dB.
