Questions with the keyword 'sound'

• Could you please explain how a CD can play sound when in a CD player. by A Swann to Anna, George, Jodi, Rob, Stefan Comments: (No comments so far )
• What is sound? And therefore does a tree make a noise if it falls in the forest but no one is around to hear it? by AnswerME123 to Anna, George, Jodi, Rob, Stefan Comments: (No comments so far )