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.

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step-by-step explanation:

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.