01JUN21TUE

100 = 10^2

1000 = 10^3

10000 = 10^4

200 = 2*10^2

2000 = 2*10^3

20000 = 2*10^4


321

= 321 * 10^0

= 32.1 * 10^1

= 3.21 * 10^2

= 0.321 * 10^3

= 0.0321 * 10^4

Standard exponent form of 321 = 3.21 * 10^2


1 day = 86400 seconds = 8.64 * 10^4

1 week = 604,800 seconds = 6.048 * 10^5

1 month = 2,592,000 seconds = 2.592 * 10^6

1 year = 31,536,000 seconds = 3.1536 * 10^7

Speed of light = 300,000 km per second = 3 * 10^5 km/s

Time taken by light to travel from Sun to Earth = 500 seconds = 5 * 10^2 s

Distance between Sun and Earth = 3 * 10^5 * 5 * 10^2 = 15 * 10^7 = 1.5 * 10^8 km

Distance travelled by light in a year = 3 * 10^5 * 3.1536 * 10^7 = 9.4608 * 10^12 km 

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