Based on what you know about the root phon, what does the word phonometry mean?
the measurement of language
the measurement of visual images
the measurement of sound
the measurement of density

Based on what the root word phon means, the word phonometry means "The measurement of sound"

Explanation:

Phon is a Greek root word that means "sound" it can be used as a prefix and as a suffix as well, in this case, we have it as a prefix followed by metry which comes from meter that is related to the measurement of anything, then both together give us the definition that Phonometry is the measurement of sound with a phonometer.

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idkexplanation:

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