B. Fill in the blanks.
1. The fact that the time period of a pendulum remains the
same is used in a _______
clock.
2) Before crystals were used, the ______ used to measure
time in watches.
3. In a modern wrist watch, time is measured by the
vibrations of a ______ crystal.
4. The SI unit of speed is _______
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Answer:
answer this question when you give me a love sin
Answer:
1 m/ a
2 sand clock etc
speed
second