Read the questions carefully. Choose the best answer and write
this on a separate sheet of paper.
1. What form of energy is produced when objects vibrate?
C. song
A. music
B. noise
D. sound
2. Why does sound become weaker or fainter as it moves away
from the observer? The sound
A. is already absorbed by the environment
B. spreads to cover a smaller area
C. spreads to cover a larger area
D. lowered by the operator​