How would you describe the frequency of a wave when the sound is high pitched?

The description of frequency in relation to sound waves is fundamentally tied to how tightly packed the waves are. When a sound is high pitched, it corresponds to a higher frequency, which means that the waves oscillate back and forth more times in a given time period compared to lower frequency sounds. This higher frequency results in the waves being close together, or having a smaller wavelength, which is characteristic of higher-pitched sounds.

Conversely, options that suggest the waves are spaced far apart or are slow would relate to lower frequencies and lower pitches, which is not applicable to high-pitched sounds. The mention of waves in a vacuum is irrelevant in this context, as sound requires a medium to travel through and does not propagate in a vacuum. Thus, the correct understanding of high-pitched sounds leading to waves being close together is affirmed by the direct relationship between frequency and pitch.