A nanosecond is one billionth of a second, or 1/1,000,000,000 seconds.
Therefore, 9 nanoseconds is nine billionths of a second, or 9/1,000,000,000 seconds, or
9.0 x 10-9 seconds.
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There are 1 billion nanoseconds in a second. Therefore, 9 nanoseconds is equal to 9/1,000,000,000 seconds, which is a very small fraction of a second.
There are 1,000,000 nanoseconds in one millisecond.
To convert seconds to nanoseconds, you would multiply the number of seconds by 1,000,000,000 (since 1 second is equal to 1,000,000,000 nanoseconds). For example, 1 second would be equal to 1,000,000,000 nanoseconds.
There are 1,000,000,000 nanoseconds in a second. Therefore 1.5/1000000000 is 0.0000000015 seconds
To convert seconds to nanoseconds, you would multiply the number of seconds by 1,000,000,000, since there are 1,000,000,000 nanoseconds in one second. For example, 1 second is equal to 1,000,000,000 nanoseconds.
Work it out by basic dimensional analysis! One (average) year = 365.24 days One day = 24 hours One hour = 60 minutes One minute = 60 seconds so there are 365.24 * 24 * 60 * 60 seconds in a year. One nanosecond is 10**9 seconds so multiply the above answer by 10**9 (or just shift the decimal point 9 places, it's loads easier) BTW this same approach can be used to convert any comparable sets of units, e.g. miles per hour into metres per second, or even furlongs per fortnight if you really want to try.