1. Fill in the blanks.
a.
When a metal bell rings, the first vibration takes place in
b. Vibrations cannot travel in ..........................
Pon......... musical instrument can be made with a ball and a string. .
d. The rapid to and fro or up and down movement are known as
The time taken by metal bob to complete one oscillation is called its ......
C.
e.
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Answer:
b gases
d oscillatory motion
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