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Physics · UNITS AND MEASUREMENT
हिन्दीThe diameter of the earth is \( 1.28 \times 10^7\text{ m} \). Its order of magnitude is:
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Correct answer · Option B
\( 10^7 \)
Explanation
In scientific notation \( a \times 10^b \), when \( a \) is rounded off to the nearest power of 10, the exponent \( b \) represents the order of magnitude. Here \( b = 7 \).
