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"The rate of diffusion will vary, based on the sample -- what type of rock it is, the number of cracks and amount of surface area, and so on," Hayes says.
"So, there's not a simple equation that can be applied to every circumstance.
And you have to check to make sure he touches the edge at the end of each lap.
Without these observations you cannot be sure that the time is valid.
Then, by assessing the isotope concentrations of rubidium and strontium, scientists can back-calculate to determine when the rock was formed.
The three isotopes mentioned can be used for dating rock formations and meteorites; the method typically works best on igneous rocks. The data from radioisotope analysis tends to be somewhat scattered.
This function is able to tell researchers how old a sample is. But there's a wrinkle in the process that has been overlooked.
The ratios of strontium-86 to rubidium and strontium-87 are thought to only be influenced by the radioactive decay of the rubidium-87 into strontium-87.
"It's a pain in the neck, but it will make our estimates significantly more accurate," Hayes says.Without the starting time it is Actually, knowing the starting time is still not enough.During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.When I have asked an audience this question they have looked at me incredulously and said, “Starting time?” You cannot know how long the swimmer took unless you knew the time on the wristwatch when the race started.