The following data were collected for a phosphorescent paint being proposed for use in coating highways....

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Question

The following data were collected for a phosphorescent paint being proposed for use in coating highways....

The following data were collected for a phosphorescent paint being proposed for use in coating highways.

Time (s)	Intensity (lux)
10	1574
20	812
30	419
40	216
50	111
60	57
70	30
80	15
90	8
100	4

Calculate the half-life for the paint.
__________________ s

What is the intensity of the light at the 2^nd half-life?
____________________________ lux

What is the intensity of the light at the 3^rd half-life?

_________________________lux

science chemistry

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Answer 1

Answer #1

Hi,

The graph between Intensity (lux) vs Time (s) follows an exponential curve.

Let's check, if this curve gives a straight line when we plot ln (Intensity) vs Time (s). If it does, than the decay of paint follows first order reaction kinetics.

Thank you

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Answer 2

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