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madam [21]
3 years ago
5

1. If some unimaginable calamity destroyed the Sun, using the astronomical unit for the Earth-Sun distance and the value for the

speed of light above, how long would we still have light after the Sun ceased to exist? (5)
Physics
1 answer:
Vsevolod [243]3 years ago
8 0

Answer:

8 minutes and 20 seconds

Explanation:

Average Distance between Earth and Sun: 150 million km   = 1.5 * 10^{8} km

Velocity of light: 3 * 10^{8} \ m/s   =   3 * 10^{5} \ km/s

Time = Distance/Speed

or Time = 1.5 * 10^{8} \ km / 3 * 10^{5} \ km/s

= 5 * 100

= 500 seconds

⇒ Time = 8 minutes and 20 seconds

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