please tall the answers of these
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Explanation:
the measurement of small time interval became possible with the development of
(c) pendulum clock
the regular vibrations of electricity driven crystal are used for measuring time very accurately
(d) quartz crystals
the clock and watches used for measuring time are based on
(c) periodic motion
sundail is device used for measuring
(c) time
smallest unit of time
(c) nanosecond