How long will it take for 475 mg of a sample of radium-225, which has a half-life of about 15 days, to decay to 30 mg?
1 answer:
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Answer:
2
Step-by-step explanation:
Given:
Total length of ribbon = 1 yard
Length of ribbon used for project = yard
Length of ribbon the rest of ribbon is to be divided = yard
To find:
The number of ribbons of length yard that can be made = ?
Solution:
Length of ribbon left after the 1 yard ribbon is used for project can be calculated by subtracting the length of ribbon used from the initial length of ribbon.
i.e.
Length of ribbon left = yard
Now, number of ribbon of length yard can be found be dividing the length of ribbon left with the length of ribbon pieces to be cut.
i.e.
Number of ribbons: