Distance of the moon from the earth is $4 \times 10^{8} m$ . The time taken by a radar signal transmitted from the earth to reach the moon is (Given speed of light $= 3 \times 10^{8}$ m/s)

5.2 s

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1.3 s

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2.6 s

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0.70 s

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Solution

The correct option is A $1.3 s$
Distance between moon and earth $=$ $4 \times 10^{8} m$
Speed of the radar signal $= 3 \times 10^{8} m / s$
Time taken to travel $= \frac{d i s t a n c e}{s p e e d}$ $= \frac{4 \times 10^{8}}{3 \times 10^{8}}$ $= 1.33 s$

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Distance of the moon from the earth is 4×108m. The time taken by a radar signal transmitted from the earth to reach the moon is (Given speed of light =3×108 m/s)

The correct option is A 1.3 sDistance between moon and earth = 4×108mSpeed of the radar signal=3×108m/sTime taken to travel=distancespeed=4×1083×108=1.33 s

Distance of the moon from the earth is $4 \times 10^{8} m$ . The time taken by a radar signal transmitted from the earth to reach the moon is (Given speed of light $= 3 \times 10^{8}$ m/s)

The correct option is A $1.3 s$
Distance between moon and earth $=$ $4 \times 10^{8} m$
Speed of the radar signal $= 3 \times 10^{8} m / s$
Time taken to travel $= \frac{d i s t a n c e}{s p e e d}$ $= \frac{4 \times 10^{8}}{3 \times 10^{8}}$ $= 1.33 s$