Radium disintegrates at a rate proportional to the amount present. If one-half of any givenamount of radium will disappear in 1590 years, what fraction will disintegrate during the firstcentury? How long will it be before one-fourth of the original amount has disintegrated?

Radium disintegrates at a rate proportional to the amount present. If one-half of any given
amount of radium will disappear in 1590 years, what fraction will disintegrate during the first
century? How long will it be before one-fourth of the original amount has disintegrated?

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