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Franz1957
2 years ago

The answer to (b) is found in this way: it is calculated how many halvings the amount of the substance has decreased to about 3.1%. The simple method for this is testing.

(1/2)^0 = 1

(1/2)^1 = 1/2

(1/2)^2 = 1/4

(1/2)^3 = 1/8

(1/2)^4 = 1/16

(1/2)^5 = 1/32

The same, expressed with commas:

0,5^0 = 1.0

0.5^1 = 0.5

0,5^2 = 0,25

0,5^3 = 0,125

0,5^4 = 0,0625

0,5^5 = 0,03125

(There is also another method for cases where you don’t get along well with trial. It is then calculated with logarithms.)

Ralph1952
2 years ago
Reply to  Franz1957

Or 3.1 % (as on the graphic) after 5 half-life.

gregor443
2 years ago

Sorry!

a) is read correctly!!

b) I think you’re supposed to have five half-life, even though your teacher’s doing bullshit here.

Because 5 half-life times are not an exact measure, but an arbitrary period of time.

Unfortunately, no week passes here without tasks being presented, where German teachers do not control their own substance!!