31. What does a wave carry? A. Energy B: Mater C. Molecule D. Parce
32. Which letter represent the amplitude of a wave?
A. A B. B. C. C. D. D
33. Which letter represent the wave length?
A. A b. B. B c. C. D. D
34 on a decibel scale,an encrease of 1Db means that sound intensity is increased by factor of?
A. 10 b. 20. C. 100 D. Timbre
32. Which letter represent the amplitude of a wave?
A. A B. B. C. C. D. D
33. Which letter represent the wave length?
A. A b. B. B c. C. D. D
34 on a decibel scale,an encrease of 1Db means that sound intensity is increased by factor of?
A. 10 b. 20. C. 100 D. Timbre
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