Some watch dials are coated with a phosphor, like ZnS,and a polymer in which some of the 1H atoms have beenreplaced by 3H atoms, tritium. The phosphor emits lightwhen struck by the beta particle from the tritium decay,causing the dials to glow in the dark. The half-life of tritiumis 12.3 yr. If the light given off is assumed to be directly proportionalto the amount of tritium, by how much will adial be dimmed in a watch that is 50 yr old?
Some watch dials are coated with a phosphor, like ZnS,and a polymer in which some of the 1H atoms have beenreplaced by 3H atoms, tritium. The phosphor emits lightwhen struck by the beta particle from the tritium decay,causing the dials to glow in the dark. The half-life of tritiumis 12.3 yr. If the light given off is assumed to be directly proportionalto the amount of tritium, by how much will adial be dimmed in a watch that is 50 yr old?
Chapter19: The Nucleus: A Chemist's View
Section: Chapter Questions
Problem 6Q
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Question
Some watch dials are coated with a phosphor, like ZnS,
and a
replaced by 3H atoms, tritium. The phosphor emits light
when struck by the beta particle from the tritium decay,
causing the dials to glow in the dark. The half-life of tritium
is 12.3 yr. If the light given off is assumed to be directly proportional
to the amount of tritium, by how much will a
dial be dimmed in a watch that is 50 yr old?
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