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Table 1.3 – Approximate Values of Some Time Intervals in seconds
5 ϫ 10^17: Age of the Universe
1.3 ϫ 10^17: Age of the Earth
6.3 ϫ 10^8: Average age of a college student
3.2 ϫ 10^7: One year
8.6 ϫ 10^4: One day (time interval for one revolution of the Earth about its axis)
3.0 ϫ 10^3: One class period
8 ϫ 10^-1: Time interval between normal heartbeats
~ 10^3: Period of audible sound waves
~ 10^-6: Period of typical radio waves
~ 10^-13: Period of vibration of an atom in a solid
~ 10^-15: Period of visible light waves
~ 10^-22: Duration of a nuclear collision
~ 10^-24: Time interval for light to cross a proton
Esta é uma grande tabela! 
