Aspace probe on the surface of mars sends a radio signal back to earth, a distance of 7.19 ×10⁷ km. radio travel at the speed of light (3.00 ×10⁸ m/s). how many seconds does it take for the signal to reach the earth?

The time taken by the signal to reach the earth is 240 s.

Explanation:

As it is known that speed of any particle is defined as the rate of change in distance per unit time. So depending upon how much distance is covered in a given time, the speed of that travelling particle can be determined. In this case, the distance to be covered is given as km . And it is also known that any radio signal travels with the speed of light. So the speed or velocity of the signal is given as m/s. Thus, . So, . Since the distance is given in km, we have to convert it to meter.

Thus,.

So,.

Thus, nearly 240 s are required by the signal to reach the earth.