Question

The distance between two planets is $2.496\times {10}^{11}$ m and the distance between a planet and its satellite is $4.84\times {10}^8$ m. Calculate the difference of these distances in metres.

• A. $2.491\times {10}^{11}$ m
• B. $2.491\times {10}^{12}$ m
• C. $2.491\times {10}^{21}$ m
• D. $2.491\times {10}^{13}$ m

Answer 1

The correct option is A $2.491\times {10}^{11}$ m

Given: Distance between two planets $=2.496\times {10}^{11}$ m,

Distance between two the planet and its $=4.84\times {10}^8$ m

Total distance $=2.496\times {10}^{11}-4.84\times {10}^8=2.496\times 1000\times {10}^8-4.84\times {10}^8$

$=(2496–4.84)\times {10}^{8}m=2491.16\times {10}^{8}m=2.491\times {10}^{11}m$