1. What is the chief acoustic cue for a source feature?The chief acoustic cue for a source feature comes from the presence of what is called phonation energy that will show up as a low frequency voice bar when observed on a spectrogram. The energy of the frication noise is periodic and due to a second sound source will show up as vertical voicing lines on the spectrogram. The energy of the frication noise will fall in voiced fricatives.

2. What is the chief acoustic cue for a stop next to a vowel?
Vowels have the most energy of all speech sounds so the chief acoustic cue for a stop next to a vowel will show up as a an immediate drop in energy on a spectrogram since vowels show up as the darkest and longest on a spectrogram.

3. What is the chief acoustic cue for a stop in a consonant cluster (not next to a vowel)
The chief acoustic cues for a stop in a consonant cluster are characterized by the silent period during the start of being produced. This shows up as no energy or some kind of a low frequency for a pre-voiced stop. Other cues that are distinctive of a stop manner of production are a quick burst in the release of air, and the rapidness of transitions to and from the stop.

4. What are the chief acoustic cues for a fricative?
The chief acoustic cues for a fricative comes from the duration of the frication noise produced which is extended during its articulation.

5. What are the chief acoustic cues for a vowel?
The chief acoustic cues for a vowel reside in the frequencies of their format. The relationship that exists between F1 and F2 for the acoustic cues of a vowel are very important.