I need answer ASAP?? If we determine the exponential decay of an isotope to be o

Question

I need answer ASAP??

If we determine the exponential decay of an isotope to be of the fogm 2e0, then the decay half life of the isotope is QUESTION 5 1 points Save Answer Isotope of an element has 65 neutrons in its nucelus. If the number of the nucleons in this isotope is 106, how many protons do exist in the nucleus of this isotope? (This isotope might not exist in nature at al) QUESTION 6 1 pointsSave Answer 13 In a nuclear reaction 7.8x10 kg mass disappears. If this mass is converted into energy, how much energy in Jouls is produced in this reaction? Do not include the units in the answer. QUESTION 7 1 points Saved In beta decay, a transforms into a. and an electron. proton, electron O neutron, electron O electron, electron neutron, proton

Explanation / Answer

question 4:

decay equation: A*e^(-k*x)

half time is the value of x for which remaining un-decayed isotopes are A/2

A/2=A*e^(-k*x)

==>1/2=e^(-k*x)

==>-k*x=ln(1/2)

==>half life=ln(2)/k

given k=0.7

half life=ln(2)/0.7

=0.99021 seconds

Question 5:

number of nucleons=number of neutrons + number of protons

==>106=number of protons+65

==> number of proton=106-65=41

Question 6:

energy=mass*speed of light^2

=7.8*10^(-13)*(3*10^8)^2

=70200 J

question 7:

in beta decay, neutron transforms into a proton and electron.

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