Question

The radii of the Earth and its orbit are 6371 km and 149 X 106 km. The diameter
of the Earth's orbit is more than that of the Earth by ....... orders of magnitude.​

Answer 1

The Earth's radius is 6371 km. The order of magnitude of the Earth's radius is 10^3 m. The order of the magnitude will be the number that is measured with the base as 10. The order is equal to the log value....

now, 6371000m = 0.6371 × 10^7 m

here you can see √10/10 ≤ 0.6371 ≤ √10

so, 10^7m is the order of magnitude.