Question

what does the root phon mean? far away look at or observe measure sound same

Explanation:

The root "phon" comes from the Greek word "phōnē" which means "sound". For example, in the word "telephone", "tele" means "far" and "phon" means "sound", so it's something that transmits sound over a distance. In "symphony", "sym" (or "syn") means "together" and "phon" means "sound", referring to a harmonious combination of sounds.

Answer:

sound