One billion. 1 millisecond = 1/1000th of a second. 1 microsecond = 1/1,000,000 of a second. 1 nanosecond = 1,000,000,000 of a second. 1 picosecond = 1,000,000,000,000.
1000 x 1,000,000,000 = 1 trillion. 1 picosecond is a trillionth of a second.
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1 picosecond = 10-12 second1 millisecond = 10-3 second = (10-3 / 10-12) = 109 picoseconds
1 second = 1, 000, 000, 000, 000 picoseconds. This means that there are 1 trillion picoseconds in 1 normal second.
Light travels 186000 miles (approximately) per second So 1 mile will be traveled in 1/186000 seconds. There are 10^12 picoseconds in a second Therefore light will travel 1 mile in (1/186000) x 10^12 picoseconds and that evaluates to 53763440.86 picoseconds
There are 1000000000000 picoseconds in one second. Therefore, 12 seconds is equal to 12 x 1000000000000 = 12000000000000 picoseconds.