Question

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 1

Answer:

2. one oscillation

Explanation: