Final answer:
The perception of frequency is called pitch. Humans can distinguish between different sounds based on their frequencies, and musical notes represent sounds of specific frequencies.
Step-by-step explanation:
The perception of frequency is called pitch. Humans can distinguish between different sounds based on their frequencies, and typically, they can discriminate between two sounds if their frequencies differ by 0.3% or more. Musical notes have particular names, such as A-sharp, C, or E-flat, and they represent sounds of specific frequencies. Therefore, the number of types of pitches of sound is not fixed, as it depends on the frequency range and the specific musical notes being considered.
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