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24 May 2018, 05:37
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
73% (02:22) correct
27%
(02:13)
wrong
based on 191
sessions
History
Date
Time
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Not Attempted Yet
The Sun is approximately 1,400 million kilometers from the planet Saturn, and light from the Sun travels to Saturn at the rate of approximately 300,000 kilometers per second. Approximately how many minutes does it take for light to travel from the Sun to Saturn?
A) 80
B) 130
C) 160
D) 280
E) 360
A) 80
B) 130
C) 160
D) 280
E) 360
24 May 2018, 19:32
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Bunuel
The distance from the sun to the planet Saturn is 1400 million kilometers or 1400*1000000 km.
We know that light travels from the Sun at a rate of 300000 km/s or 300000*60 = 18*1000000 km/minute
Time = \(\frac{Distance}{Speed}\) = \(\frac{1400 * 1000000}{18 * 1000000} = 77.8\)
Therefore, it takes approximately 80(Option A) minutes for light to travel from the Sun to planet Saturn.
25 May 2018, 11:59
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Solution
Given:
• The sun is approximately 1,400 million km from Saturn
• Light travels to Saturn at the rate of approximately 300,000 km/sec
To find:
• Approximately how many minutes does it take for light to travel from the Sun to Saturn
Approach and Working:
In this question, the distance between the Sun and Saturn is provided, along with the speed of light
• Therefore, the time taken = \(\frac{distance}{speed}\) = \(\frac{{14 * 10^8}}{{3 * 10^5}}\)sec = \(\frac{{14 * 1000}}{{3 * 60}}\) minutes = 77 minutes approx
Hence, the correct answer is option A, as it is the closest option.
Answer: A
