A В C D At which point will an image be formed? ОА Ов Ос OD
1 answer:
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Answer:
3 half-lives
Explanation:
The decay rate of the watch light intensity is given by:
<em>where : is the intensity of light that changes with time,
: is the initial intensity of light, λ: is the decay constant and t: is the decay time</em>
<u>For light to be only one-eighth as much light, it means:</u>
(1)
<u>The half-life of the tritium decay is:</u>
(2)
By entering equation (2) into equation (1), we can find the time that must pass until the watch gives off only one-eighth as much light:
Which correspond to the next half-lives:
So, until the watch gives off only one-eighth as much light must pass 3 half-lives.
I hope it helps you!