I will rate u 5 if u give me an explaination Which particle

I will rate u 5 if u give me an explaination

Which particle has the same mass as a beta particle? a positron a proton a Gamma ray an alpha particle a neutron the rate constant tor the decay of a radioactive isootope is 4.226 x 10-3 / day. What is the half-life of of this isotope? 82.00 days 164.0 days 328.0 days 410.0 days none of these The half-life of 42K is 12.5 h. How much will remain after 81 h if the original sample contained 256 g of 42K? 17 g 22 g 19 g 2.9 g 11g 55Mn can be prepared by electron capture from which of the following? 55 Fe 51V 57Co 56Mn 55Cr Which particle does the nuclide symbol a represent? helium nucleus positron electron proton Gamma photon Relative to the sum of the masses of its constituent nucleons (neutrons + protons), the mass of a nucleus is always smaller. always the same. sometimes the same and sometimes smaller. always greater. sometimes greater and sometimes smaller.

Solution

a) beta particle has mass equal to that of electron similar as positron.

b)half life = ln 2/ lambda = 0.693/(4.226*10^-3) = 163.98 days

c)half life = 12.5 hours lambda = ln2 / half life = 0.693/12.5 = 0.05544 hr-1

N = N0 e^(-lambda *t)Â

N = 256(e^(-0.05544*81)) = 2.87 gms

d)option d Mn 56 as it capture electron the no.of protons = 56-1 = 55

e)helium nucleus

f)sometimes same and sometimes smaller

as some mass might be lost in keeping the nucleus together