Learn French: Ce film est muet. - This movie is silent.

To make adjectives ending in -et feminine, you double the final consonant and add an e. So, muet becomes muette. You would use this for a feminine noun, like une lettre muette (a silent letter).

How does the pronunciation change between muet and its feminine form muette?

In the masculine form muet, the final t is silent. But in the feminine form muette, the added e at the end forces you to pronounce the double t sound clearly.

Is muet the usual word for "silent" in French?

It depends on the context! Muet specifically means "mute" (unable to speak) or "lacking spoken dialogue" (like a silent movie). If you mean a quiet place, like a silent room or a quiet car, you would use silencieux instead.

Why use Ce here instead of Cet?

Ce means "this" or "that" for masculine nouns starting with a consonant, like film. You only use cet for masculine nouns that start with a vowel or a silent h, to make them easier to say (like cet acteur - this actor).