Answer:
The sentence is a simile.
Step-by-step explanation:
Similes are those figures of speech that compares two things of different types in order to make the description more exact or vivid, with the use of the word "like" in it's sentence. On the other hand, metaphors are like similes. They are used in comparison too but the difference in this is that the comparison is not literally applicable.
"Silence will fall like dews"
The above sentence can me identified to be a simile in that it uses the comparison form, comparing silence to that of a dew. Dews don't make any noise or sound when they fall on the ground.