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What do you mean by Order of Magnitude? Give an examples. |
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Answer» Order of magnitude of quantity is the power of 10 required to represent the quantity. For determining this power, the value of the quantity has to be rounded off. While rounding off, we ignore the last digit which is less than 5. If the last digit is 5 or more than five, the preceding digit is increased by one. For example, (1) Speed of light in vacuum = 3 × 108 ms–1 ≈ 108 m/s (ignoring 3 < 5) (2) Mass of electron = 9.1 × 10–31 kg 10–30 kg (as 9.1 > 5). |
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