The Radium (Ra) nucleus decays as follow, 88Ra 226 → ZRn A + 2He 4 (a) What type of radioactive decay is this? (b) Find the atomic mass number A and the proton number Z of the resulting Radon (Rn) nucleus. (c) Given the masses (expressed in atomic mass unit, u) are 226.025410u for Radium, 222.017578u for Radon and 4.002603u for Helium and the square of the speed of light, c 2 , is 931.494 MeV/u, calculate the energy released in this nuclear decay

Why do astronauts in the space shuttle weigh less?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air