What is the smallest unit of time? (Hint: its not a nanosecond or a microsecond or a second)

Meet the zeptosecond, the shortest unit of time ever measured. Scientists have measured the shortest unit of time ever: the time it takes a light particle to cross a hydrogen molecule.

Step-by-step explanation:

zeptosecond

Scientists have measured the world's smallest unit of time, and it's called the zeptosecond. It was recorded by a group of scientists at Goethe University, in Germany and published in the Science journal.

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐