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  4. At its closest approach, the distance between the Mars and the Earth is found to be 60 million km . When the planets are at this closest distance, the time it would take to send a radio - message from a space probe of the Mars to the Earth is

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Q. At its closest approach, the distance between the Mars and the Earth is found to be $60 \, million \, km$ . When the planets are at this closest distance, the time it would take to send a radio - message from a space probe of the Mars to the Earth is

NTA AbhyasNTA Abhyas 2022

Solution:

$\text{t} = \frac{\text{distance}}{\text{speed}}$
$= \frac{6 0 \times 1 0^{6} \times 1 0 0 0 \text{ m}}{3 \times 1 0^{8 \, } \text{m s}^{-1}} = 2 0 0 \text{ s}$