If the light from star A takes 15 min to reach star B and the speed of light is 3-108m-s- then what is the distance between the stars-

The correct option is A 2.7×10^8km Given t=15 minSpeed of light =3×10^8m/s ∴ t=15min=15× 60=900 sec By using the formula Speed=Di ...

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Standard XII

Chemistry

Nature of Electromagnetic Radiation

If the light ...

Question

If the light from star $A$ takes $15$ min to reach star $B$ and the speed of light is $3 \times 10^{8} m / s$ , then what is the distance between the stars?

2.7 \times 10^{8} k m

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2, 9 \times 10^{11} k m

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2.7 \times 10^{8} m

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36 \times 10^{9} k m

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Solution

The correct option is A $2.7 \times 10^{8} k m$
Given $t = 15$ min
Speed of light $= 3 \times 10^{8} m / s$
$∴$ $t = 15 m i n = 15 \times 60 = 900 s e c$
By using the formula
$S p e e d = \frac{D i s t a n c e}{T i m e}$
$D i s t a n c e = S p e e d \times t i m e$ $= 3 \times 10^{8} m / s \times 900 s e c$ $= 2700 \times 10^{8} m$ $= 2.7 \times 10^{8} k m$

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If the light from star A takes 15 min to reach star B and the speed of light is 3×108m/s, then what is the distance between the stars?

The correct option is A 2.7×108kmGiven t=15minSpeed of light =3×108m/s∴ t=15min=15×60=900secBy using the formulaSpeed=DistanceTimeDistance=Speed×time =3×108m/s×900sec =2700×108m =2.7×108km

If the light from star $A$ takes $15$ min to reach star $B$ and the speed of light is $3 \times 10^{8} m / s$ , then what is the distance between the stars?