A wireless signal is sent to earth from a spacecraft. This signal reaches the earth in 300 seconds. Calculate the distance of the spacecraft from the earth. Given, speed of the signal = $3 \times 10^{8}$ m/s.

9 x 10⁷ km

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8 x 10⁷ km

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9 x 10⁹km

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9 x 10⁸km

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Solution

The correct option is A
9 x 10⁷ km

We know that, distance = speed x time

Here, speed = 3 * $10^{8}$ m/s

Time = 300 s

So, distance = $3 \times 10^{8}$ * 300 m = $9 \times 10^{10}$ m = $9 \times 10^{7}$ km

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A wireless signal is sent to earth from a spacecraft. This signal reaches the earth in 300 seconds. Calculate the distance of the spacecraft from the earth. Given, speed of the signal = 3×108 m/s.

The correct option is A 9 x 107 km We know that, distance = speed x time Here, speed = 3 * 108 m/s Time = 300 s So, distance = 3×108 * 300 m = 9×1010 m = 9×107 km

A wireless signal is sent to earth from a spacecraft. This signal reaches the earth in 300 seconds. Calculate the distance of the spacecraft from the earth. Given, speed of the signal = $3 \times 10^{8}$ m/s.

The correct option is A
9 x 10⁷ km

We know that, distance = speed x time

Here, speed = 3 * $10^{8}$ m/s

Time = 300 s

So, distance = $3 \times 10^{8}$ * 300 m = $9 \times 10^{10}$ m = $9 \times 10^{7}$ km