GK
SOLAR SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
12 million million kilometres
|
|
|
9.5 million million kilometres
|
|
|
5.5 million million kilometres
|
|
|
9 million kilometres
|
Detailed explanation-1: -The term light-year is often used in astrophysics to measure the distance between two astronomical objects. Light travels at a velocity of about 300, 000 kilometres (km) per second. It can travel about 10 trillion km. More precisely, one light-year is equal to 9, 500, 000, 000, 000 kilometres.
Detailed explanation-2: -Since light travels at about 186, 300 miles per second, with 86, 400 seconds per day and about 365 days per year, that works out at about: 186300×86400×365≈5, 875, 000, 000, 000 miles.
Detailed explanation-3: -A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year. It’s about 5.9 trillion miles (9.5 trillion km).
Detailed explanation-4: -Speed of light = 300, 000, 000 m/s = 3 x 10 8 m/s. 1 light year = 3 x10 8 m/s x 31, 536, 000 s = 9.46 x 10 15 metres. 1 light year = 9.46 x 10 15 m.