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The standard form of 0.000072 is
The usual form of 3.05 \times 10^{-4} is
Which of these numbers is the smallest?
The diameter of the Sun is about 1.4 \times 10^{9} m and the diameter of the Earth is about 1.2756 \times 10^{7} m. The diameter of the Sun is roughly how many times that of the Earth?
The mass of the Earth is 5.97 \times 10^{24} kg and the mass of the Moon is 7.35 \times 10^{22} kg. Their total mass is
Assertion (A): The standard form of 0.00056 is 5.6 \times 10^{-4}. Reason (R): In standard form k \times 10^{n}, the number k must lie between 1 and 100.
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