To make the dial of a watch glow in the dark

Reference no: EM13663820

To make the dial of a watch glow in the dark, 1.20E-9 kg of radium226Ra is used. The half-life of this isotope is 1.60E+3 yr. How many kilograms of radium disappear while the watch is in utilize for 49.0 years?

Reference no: EM13663820

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