NEET · Physics · STD 11 - 1. units,dimensions and measurement
The speed of light in vacuum is taken as unity. If light takes 6 min 40 s to reach the Earth from the Sun, the distance between the Sun and the Earth in new unit is :
- A \(3 \times 10^8\)
- B 500
- C \(3 \times 10^{10}\)
- D 400
Answer & Solution
Correct Answer
(D) 400
Step-by-step Solution
Detailed explanation
(D) 400
Speed of light in vacuum, c = 1 unit/s.
Time taken by light to reach the Earth from the Sun, t = 6 min 40 s.
Converting time into seconds:
t = 6 × 60 + 40 =360 + 40 = 400 s.
Distance between the Sun and the Earth is given by:
d = c × t
d = 1 × 400 = 400 new units.
Speed of light in vacuum, c = 1 unit/s.
Time taken by light to reach the Earth from the Sun, t = 6 min 40 s.
Converting time into seconds:
t = 6 × 60 + 40 =360 + 40 = 400 s.
Distance between the Sun and the Earth is given by:
d = c × t
d = 1 × 400 = 400 new units.
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