The sound heard when a piano key is hit is caused by
A B C D
vibration. refraction. momentum. acceleration.
Question: The sound heard when a piano key is hit is caused by
(A) vibration.
(B) refraction.
(C) momentum.
(D) acceleration.

Answer: (A) vibration.
Answer: (C) momentum.
Question: The sound heard when a piano key is hit is caused by
(A) vibration.
(B) refraction.
(C) momentum.
(D) acceleration.
Answer: (A) vibration.