Low and high frequency Hz are subjectively interpreted as what?

The correct choice emphasizes the relationship between frequency measurements and their perception as pitch. Human hearing ranges from about 20 Hz to 20,000 Hz (20 kHz), where low frequencies (like 20 Hz) are perceived as low-pitched sounds, while high frequencies (like 20 kHz) are perceived as high-pitched sounds. Pitch is fundamentally defined by the frequency of sound waves, which means that low Hz correlates with low pitch and high Hz corresponds with high pitch. Hence, when discussing low and high frequency sounds, it is most accurate to interpret them as low and high pitch, which directly correlates to how the human auditory system processes these frequencies.

Other options involve terms that conflate volume or loudness with frequency, which are different aspects of sound. Volume relates to the amplitude of sound waves, not their frequency. Therefore, while loudness and quietness (or soft vs. loud) are relevant when discussing sound, they do not correctly represent the specific nature of low and high frequencies in terms of pitch.