Sound is produced by:
- a. Vibrating objects
- b. Only pure silent objects always
- c. Unrelated to this idea
- d. Opposite of the correct idea
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Vibration means:
- a. Not a standard school answer
- b. Rapid to-and-fro motion
- c. Unrelated to this idea
- d. Opposite of the correct idea
Sound needs:
- a. Only pure vacuum always
- b. A medium
- c. Unrelated to this idea
- d. Opposite of the correct idea
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