The moon is at a distance of $4 \times 10^{8} m$ from the earth. A radar signal is transmitted from the earth will reach the moon in about

2.6 s

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1.3 s

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5.2 s

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6.5 s

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Solution

The correct option is B $1.3 s$
Radar signal which is transmitted, is an electromagnetic wave having the speed of, $v = 3 \times 10^{8} m / s$ .
Given , distance of moon from earth, $d = 4 \times 10^{8} m$ ,
Therefore, time for signal to reach there, $t = \frac{d}{v} = 4 \times 10^{8} / (3 \times 10^{8}) = 1.3 s$

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The moon is at a distance of 4×108m from the earth. A radar signal is transmitted from the earth will reach the moon in about

The correct option is B 1.3sRadar signal which is transmitted, is an electromagnetic wave having the speed of, v=3×108m/s.Given , distance of moon from earth, d=4×108m ,Therefore, time for signal to reach there, t=dv=4×108/(3×108)=1.3 s

The moon is at a distance of $4 \times 10^{8} m$ from the earth. A radar signal is transmitted from the earth will reach the moon in about