18. blank is the amount of energy in a sound wave
A. amplitude
B. volume
C. echo
D. vibration
19. Sound is a form of energy in a sound wave
A. amplitude
B. volume
C. echo
D. vibration
19. Sound is a form of energy produced by
A. vibration
B. prisms
C. distance
D. vibration
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Answers & Comments
no 18 answer= b. no 19 answer= d. no 20 answer= b