If 160. mg of fluorine-18 is shipped at 8:00 A. M., how many milligrams of the radioisotope are still active when the sample arrives at the radiology laboratory at 1:30 P. M.?

Explanation:

Two important equations in radioactive decay are

We can use them to solve this problem.

1. Calculate the radioactive decay constant

The half-life of ¹⁸F is 109.8 min.

(ii) Calculate the mass of ¹⁸F remaining

Time in transit  = 13:30 - 08:00 = 05:30 h = 5.50 h = 330 min

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

there is none because earth is stationary and flat.