When producing the vowel /i/, what characteristic is observed in acoustic measures?

When producing the vowel /i/, a characteristic observed in acoustic measures is a high second formant frequency (F2) and a low first formant frequency (F1).

The first formant (F1) is inversely related to vowel height; lower F1 values indicate a higher tongue position in the mouth during articulation. Since /i/ is a high front vowel, it is produced with the tongue elevated towards the roof of the mouth, resulting in a lower F1 frequency.

On the other hand, the second formant (F2) is related to vowel backness; higher F2 values indicate a more fronted tongue position. The vowel /i/ is articulated at the front of the mouth, leading to higher F2 frequencies.

Together, the low F1 and high F2 of the vowel /i/ contribute to its distinct acoustic profile, allowing listeners to identify it accurately among other vowel sounds.