Question

3.
It takes time 8min 20 seconds for light to reach from sun to the earth surface. If speed of
light is taken to be 3x10 km/s. Find the distance of the sun from the earth in SI system.
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Answer 1

CORRECT QUESTION:

It takes time 8 min 20 seconds for light to reach from sun to the earth surface. If speed of light is taken to be 3x10^5 km/s. Find the distance of the sun from the earth in SI system.

ANSWER:

Distance = 1.5 × $10^{11}$ m

CONVERSIONS USED:

1 minute = 60 s

1 km/s = 1000 m/s

GIVEN:

TIME = 8 minutes 20 seconds = 500 s

SPEED = 3 × $10^{5}$ km/s = 3 × $10^{8}$ m/s

FORMULAE:

Distance = Speed × Time

EXPLANATION:

Distance = 3 × $10^{8}$ × 500

Distance = 15 × $10^{10}$

Distance = 1.5 × $10^{11}$ m

Distance of the sun from the earth = 1.5 × $10^{11}$ m

EXTRA POINTS:

• RADIUS OF EARTH = 6400 km = 6.4 × $10^{6}$ m

• MASS OF EARTH IS 5.9 × $10^{24}$ kg

• MOON TAKES 27 DAYS TO COMPLETE ITS ONE REVOLUTION AROUND THE SUN.

• IT TAKES 29.5 DAYS FOR MOON TO TRANFORM FROM FULL MOON TO NEW MOON.

Answer 2

Answer:

11.5×10¹¹m

Explanation:

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