Becquerel's discovery of radiation from uranium salts was important in that: It confirmed that both phosphorescene and luminescence can result in the emission of energy it opened a market for uranium His grant provided support for Pierre and Marie Curie. D. Energy was emitted from this material continuously, without an external input of energy A B

In the picture are two diagrams of the first five orbits in the Bohr model labeled A - E. The dot in an orbit is the electron. The nucleus is not shown. Shown is a BEFORE and AFTER state of the atom. An energy level diagram for the Bohr hydrogen atom is shown. Which of these events has occurred in going from the BEFORE to the AFTER state?         a. a photon of energy 0.97 eV has been emitted   b. a photon of energy 1.51 eV has been absorbed   c. a photon of energy 1.51 eV has been emitted   d. an electron of energy 1.51 eV has been emitted   e. a photon of energy 0.97 eV has been absorbed

QUESTION 1 IR radiation can. ionize atoms. cause valence e-1 transitions. induce rotations in molecules. cause inner-shell el transitions.

Q1. A parallel beam of 1-MeV photons is normally incident on a sheet of uranium, 1.0 mm thick. The incident beam intensity is 104 MeV/ cm s. a) Calculate the energy fluence rate transmitted by the sheet. b) What fraction of the transmitted energy fluence rate is due to uncollided photons? c) What physical processes are responsible for energy transfer to the sheet? Given (µen/p)= 0.05 cm²/g p= 18.79 g/cm'.

3. The mass attenuation coefficient of copper is 0.0589 cm2/g for 1.0-MeV photons. Find required thickness of the protective copper shield in order to achieve 50 % reduction of X-Ray radiation intensity. The density of copper is 8.9 g/cm3. Kindly give elaborate and Explained answer .