The time taken by a light ray to travel a distance of 3 cm in vacuum is [Take speed of light in vacuum as 3 × 108 m/s] Only one correct answerA.10–8 sB.108 sC.10–10 sD.1010 s
Question
The time taken by a light ray to travel a distance of 3 cm in vacuum is [Take speed of light in vacuum as 3 × 108 m/s] Only one correct answerA.10–8 sB.108 sC.10–10 sD.1010 s
Solution
The time taken by a light ray to travel a certain distance can be calculated using the formula:
Time = Distance / Speed
Given:
- Distance = 3 cm = 3 * 10^-2 m (since 1 cm = 10^-2 m)
- Speed of light in vacuum = 3 * 10^8 m/s
Substituting these values into the formula:
Time = (3 * 10^-2 m) / (3 * 10^8 m/s) = 10^-10 s
So, the correct answer is C. 10^-10 s.
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