Use the standard deviation in the displacement as well as the classical maximum possible displacement () to characterize theground state vibrational amplitude and compare these quantities to an estimate of the bond lengths in these molecules obtained fromthe atomic covalent radii for h (37 pm), f (72 pm), cl (99 pm), and br (114 pm).

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step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

think the answer is 30 degrees. if not than it is 20 degrees. not 100% sure. let me know if it was right.

gill russ