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What type of phenomenon can be used as a...

What type of phenomenon can be used as a measure of time ? Give two examples.

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Any phenomenon that happens regularly with time can be made use of as a standard of time Examples are periodic vibration of pendulum, oscillation of certain crystals, decay of radioactive substance etc.
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  11. What is principle of homogeneity?

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  12. How rational system is helpful?

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  14. What significant figures signify?

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  15. Differentiate between permissible and experimental errors?

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  18. What we name something which possess weight and occupies space?

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  19. The mechanical device which converts heat energy into mechanical energ...

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  20. Which branch of physics deals with study of motion.

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