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Hope I could help.
The number of half -lives that has passed after 105 hours for krypton-79 that has half-life of 35 hours is calculated as below
if 1 half life = 35 hours
what about 105 hours = ? half-lives
= (1 half life x105 hours) /35 hours = 3 half-lives has passed after 105 hours
Hello there.
Thomson's atomic model is best described by which of the following statements?
A nucleus with electrons moving around it like planets.
Psychical(you see the changes visible) and Chemical properties(they react and combine, you may see fizzing or bubbles).
Answer: solvent
solvent is A solvent is usually a liquid
