Physics - Grade XI or Standard XI
Order of Magnitude
Order of magnitude:
Order of magnitude of a physical quantity is defined as the value of its magnitude rounded off to the nearest integral power of 10.
The magnitude of any physical quantity can be expressed as A × 10n where A is a number such that 0.5 <= A < 5 and ‘n’ is an integer, called order of magnitude.
Example, radius of earth, R = 6400 km = 0.64 × 107 m.
Therefore, order of magnitude of radius of earth is 107 m.
Similarly, order of magnitude for: (a) mass sun is 1030 kg, (b) mass of earth is 1025 kg, (c) mass of an electron = 10-30 kg, (d) distance of sun from earth = 1011 m.
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