1.

2.The time taken for one to and fro movement is called________3.The electronic watches use the vibrations of_______crystal.5.___________in the car gives the distance travelled in kilometers.6. The speed of an aircraft is measured in the unit________7.__________is an early device used to tell the time of the day.please answer this question with the correct answer please..​

Answer»

Answer:

2. ONE oscillation

Explanation:



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