Plutonium-239, recovered from dismantled atomic weapons, undergoes simultaneous alpha and gamma decay. Sensors on the outside of containers used to store plutonium-239 can indicate how much radioactive material is contained by monitoring the gamma rays emitted by the material. A particular container holds 80.0 kg of plutonium waste. The half-life of plutonium-239 is 2.4 x 10 years. When a plutonium-239 atom decays, it emits a gamma photon that has 1.8 x 10% eV of energy and an alpha particle that has a characteristic speed of 1.58 x 107 m/s. Which of the following diagrams shows the orientation of the momenta of the alpha particle and the gamma photon that must result in the maximum impulse of the plutonium-239 nucleus? A. C. Y Y B. D. Y

The number of radioactive nuclei present at the start of an experiment is 5.38 × 10¹5. The number present twenty days later is 5.02 × 10¹4. What is the half-life (in days) of the nuclei?

1.a. A 14-gram ovarian tumor is treated using a sodium phosphate solution in which the phosphorus atoms are the radioative phosphorus-32 isotope with a half-life of 14.3 days and which decays via beta emision (RBE=1) with an energy of 1.71 MeV. Half of the sodium phosphate is absorbed by the tumor and deposits 9.0 J energy into it. The other half of the solution is absorbed throughout the patient's tissues, also depositing 9.0 J of energy into the 50.0 kg of body tissues.             i. What is the dose ( in gray and rem) that the tumor receives?           ii. What is the dose ( in milligray and rem) that the rest of the tissues receives?   b. Photoelectrons from a material with a binding energy of 2.71 eV are ejected by 420-nm photons. Once ejected, how long does it take these electrons to travel 2.50cm to a detected device? c.The heating element in an electric kettle is rated as 2.0kW. If the waterin the kettle is at 1000.0 oC, what volume of water will be converted in to steam in…

After 1.86 days, the activity of a sample of an unknown type of radioactive material has decreased to 88.2% of the initial activity. What is the half-life of this material?

A uranium-235 nucleus absorbs a neutron and the splits into a bromine-87 nucleus, a lanthanum-146 nucleusand additional neutrons. What is the energy released in the reaction? (Bromine-87 = 86.920711 u, andlanthanum-146 = 145.925791 u)

Solve problem 17 by using equation (2,2) and the k value determined by solving 16.

1.a. A 14-gram ovarian tumor is treated using a sodium phosphate solution in which the phosphorus atoms are the radioative phosphorus-32 isotope with a half-life of 14.3 days and which decays via beta emision (RBE=1) with an energy of 1.71 MeV. Half of the sodium phosphate is absorbed by the tumor and deposits 9.0 J energy into it. The other half of the solution is absorbed throughout the patient's tissues, also depositing 9.0 J of energy into the 50.0 kg of body tissues.             i. What is the dose ( in gray and rem) that the tumor receives?           ii. What is the dose ( in milligray and rem) that the rest of the tissues receives?   b. Photoelectrons from a material with a binding energy of 2.71 eV are ejected by 420-nm photons. Once ejected, how long does it take these electrons to travel 2.50cm to a detected device? c.The heating element in an electric kettle is rated as 2.0kW. If the waterin the kettle is at 1000.0 oC, what volume of water will be converted in to steam in…

The radioactive isotope of lead ^209Pb decays according to the differential equation dN/dt=-kN.  The isotope has a half-life of 3.3 Hours.  If 1 gram is presented initially, how long will it take for 78% of the lead to decay?

44. A metal ramp 6.00 m long is tilted 10.0° and is used to load and unload a moving van. Suppose a 20.0 kg box is pushed up the ramp and it slides with a friction coefficient of 0.30. The ramp can be viewed as a “machine” where the useful output is the potential energy gain of the box and the input is the physical work done by the person doing the pushing. (a) Determine the efficiency of the ramp. (b) Determine the ratio of the force needed to lift the box without the ramp to the force needed to push it along the ramp (this is called the mechanical advantage).

Radon is a colorless, odorless, radioactive noble gas. Because it occurs naturally in soil, it can become trapped in homes and buildings. Despite a short half-life of only 3.83 days, high concentrations of radon indoors can pose a risk of lung cancer. (For this reason, many modern homes and buildings have radon reduction systems installed.) Consider an enclosed space in a building which contains 3.03 g of radon gas at time t = 0. What mass of radon (in g) will remain in this space after 2.20 days have passed? |9 Need Help? Read It