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

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 B $1.3 s$
The $t i m e = \frac{d i s t a n c e}{s p e e d}$
speed is speed of light $3 * 10^{8} m / s$
$t = \frac{4 * 10^{8}}{3 * 10^{8}} = 1.3 s$

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The motion is 4×108m from the earth. A radar signal transmitted from the earth will reach the moon in about

The correct option is B 1.3sThe time=distancespeedspeed is speed of light 3∗108m/st=4∗1083∗108=1.3s

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

The correct option is B $1.3 s$
The $t i m e = \frac{d i s t a n c e}{s p e e d}$
speed is speed of light $3 * 10^{8} m / s$
$t = \frac{4 * 10^{8}}{3 * 10^{8}} = 1.3 s$