Half life is defined as the amount of time it takes for a radioactive material to divide itself into half after radioactive decay process. So basically, after the prescribed half-life, what transforms to another material is 1/2 of the original and what is left is 1/2 as well. In this case, the formula applicable is
ln N/No = -kt
where N represents the masses before and after decay, t is the time elapsed and k is the decay rate constant.
Substituting,
ln 10/40 = -k*20
-k = <span>-0.0693
To find t1/2 or half life, then
ln 0.5 = -k*t1/2
t1/2 = ln 0.5 / 0.0693 = 0.1 minutes
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Answer:
When an apple is cut or bruised the oxygen goes into the injured plant tissue. It begins to oxidize from the reaction of the enzymes and oxygen. The apple produces melanin to protect it causing it to brown. Using vinegar and lemon juice help stop the browning because lemon juice has a compound that reacts with oxygen before the oxygen can react with apple. Also, vinegar and lemons are very acidic which slows the browning reaction.
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