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  • A laser signal is beamed towards a distant planet from the Earth and its reflection is received after seven minutes. If the distance between the planet and the Earth is 6.3 × 10 10 m, calculate the velocity of the signal.

A laser signal is beamed towards a distant planet from the Earth and its reflection is received after seven minutes. If the distance between the planet and the Earth is 6.3 × 10 10 m, calculate the velocity of the signal.

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\begin{aligned} &t=7 \min =7 \times 60 s,\\ & x=6.3 \times 10^{10} m, v=?\\ &A s \ \ v \times t=x+x\\ &v=\frac{2 x}{t}=\frac{2 \times 6.3 \times 10^{10}}{7 \times 60}=3 \times 10^{8} \mathrm{m} / \mathrm{s} \end{aligned}

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avinash.dongre

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