I can be loud or soft, I can travel far or stay near, but I do not exist without a source. What am I?

Category: Brain · Difficulty: hard

Hint: Think about what is produced when you speak.

Answer

Sound

Explanation

Sound is a wave that requires a medium to travel through and is produced by vibrations.

This is a hard brain riddle — a tricky one that takes a little thought. The answer is Sound.

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