A radioactive sample's half$-$life is $30\mathrm{.}2$ years. $1$ year $=365$ days, $1$ day $=24$ hours, $1$ hour $=60$ min, $1$min $=60$ s

Part A

What is the decay constant in year$-1?$

Keep $4$ digits after the decimal point.

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$=$

nothing

year$1$

Request$$Answer

Part B

What is the decay constant in s$-1?$

Use scientific notations, format $1\mathrm{.}234*10$n$.$

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$=$

nothing

s$1$

$$

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Part C $-$ The initial sample is $4\mathrm{.}3$ kg $.$ What is the mass of the radioactive material that remainsafter $3\mathrm{.}50$ years $?$

Keep $3$ digits after the decimal point.

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mass remains $=$

nothing

kg

$$

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Part D $-$ in Part C$,$ What is the mass of the radioactive material that has decayed in $3\mathrm{.}50$ years $?$

Keep $3$ digits after the decimal point.

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mass decayed $=$

nothing

kg

$$

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Part E $-$ New case: The initial sample has N$0=8\mathrm{.}41010$ radioactive nuclei.$$ What is the initial activity in decays$/$s $($Bq$)?$

Keep $2$ digits after the decimal point.

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R$0=$

nothing

Bq

$$

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Part F $-$ New case: The initial sample has N$0=8\mathrm{.}41010$ radioactive nuclei.$$ What is the number of radioactive nuclei that remain after $3\mathrm{.}50$ years $?$

Use scientific notations, format $1\mathrm{.}234*10$n$.$

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N $=$

nothing

$$

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Part G $-$ New case: After $3\mathrm{.}50$ years what is the activity in decays$/$s $($Bq$)?$