Final answer:
Sounds are categorized based on the articulation point and the involved articulator: the Voiced dental fricative uses the tongue and upper teeth; the Nasal velar stop is articulated with the tongue and soft palate; the Voiceless alveolar plosive involves the tongue and alveolar ridge; and the Voiced palatal approximant requires the front part of the tongue and hard palate.
Step-by-step explanation:
The classification of sounds based on the point of articulation and the articulator involved in their production for the sounds you listed are as follows:
- Voiced dental fricative: This sound requires the vibration of the vocal cords (voiced) and the placement of the tongue against the upper teeth (dental) to produce a continuous turbulent airflow (fricative).
- Nasal velar stop: For this sound, the airflow is completely stopped by the back of the tongue touching the soft palate (velar), and the air is released through the nose (nasal).
- Voiceless alveolar plosive: This sound is created without vocal cord vibration (voiceless) and involves the tongue making contact with the alveolar ridge just behind the upper front teeth (alveolar) and involves the complete stoppage and release of airflow (plosive).
- Voiced palatal approximant: This involves the vocal cords vibrating (voiced) and the front part of the tongue approaching the hard palate without creating a complete closure (palatal), allowing for a smooth air passage (approximant).