The levels of pathogens in meat products such as hamburger can be reduced by irradiating them. If you have (9.000x10^-1) kg of hamburger, and the maximum allowed dose that can be delivered to the meat is (4.0x10^0) kGy, how many (1.20x10^0) MeV electrons would it take to reach this limit? Give your answer to 2 s.f.

Radon undergoes alpha decay with a half-life of 3.8 days. What is its decay constant in s^-1?

If the binding energy of Te-126 ( A=126, Z=52) is 1.066 GeV, what is the binding energy per nucleon (in MeV)?

The mass of neutral Rubidium -85 atom (A=85 Z = 37)is: 84.9117897 u. What is Rb-85's total binding energy? Give your answer in the unit of MeV. Note - keep 4 significant figures.

Sr-90 (A=90, Z = 38) decays via ^-decay. Calculate the energy of the antineutrino (in keV) if the beta particle has a kinetic energy of (4.28x10^2) keV.

Note - you can look the atomic masses up online or in the appendix of the textbook.

Assume all the energy released are shared by the kinetic energy of the beta particle and antineutrino.

Carbon-14 has an activity of 0.25 Bq per gram of carbon for living organisms. The half-life of ¹⁴C is 5730 years. If a sample of charcoal from an archeological dig yields a ¹⁴C activity of (5.00x10^-2) Bq per gram of carbon, how old is the material?

What fraction of a radioactive sample is left after exactly (5.00x10^0) half lives? Give your answer to 3 s.f.

Your answer is assumed to be reduced to the highest power possible.