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- 1. A person with lymphoma recieves a dose of 35 gray in the form of gamma radiation during a course of radiotherapy. Most of this dose is absorbed in 18 grams of cancerous lymphatic tissue. a. How much energy is absorbed by the cancerous tissue? b. If the treatment consist of five 15 minutes session per week over the course of 5 weeks and just one percent of the gamma Ray beam are absorbed, what is the power of the gamma ray beam? c. If the gamma ray beam consist of just 0.5 percent of the photons emitted by the gamma source each of which has an energy of 0.3MeV, what is the activity in curies of the gamma ray source?Give good explanation Asap ThanksQ3: The table shows two isotopes of potassium and two isotopes of calcium. Type of emission Mass of neutral atom / u Number of electrons Number of protons Number of neutrons Total mass/u Mass defect/ u Binding energy / J Mass of the electron = 0.000549 u Mass of the proton = 1.007276 u Mass of the neutron = 1.008665 u TI ***** LEG 39K Stable 38.96371 SE nda 42K ß decay a) Use data about potassium-42 to explain the concept of mass defect. 3000 41.9624 19 19 23 42.34797 0.38557 5.76 x 10-11 De RAP 39 Ca ßt decay 38.9707 440 **** ****** D 42 Ca stable 41.95863
- Interference A laser emitting light of wavelength 550 nm is used to illuminate two parallel slits, giving two coherent sources. Interference fringes are produced on a screen 3.0 m from the slits. The separation of the fringes is 3.3 mm. a) Calculate the distance between the centres of the two slits. b) State how the separation of the fringes changes if light of a shorter wavelength were used. c) With reference to the term path difference, explain why the bright fringes are observed on the screen.Select each of the following that is a characteristic of alpha decay. The mass number of the nucleus that decays decreases by 4. O The radiation that is produced carries a negative charge. O The atomic number of the nucleus that decays increases. The chemical element of the nucleus that decays remains unchanged. O The mass number of the nucleus that decays remains unchanged. The mass number of the nucleus that decays decreases by 2. O The radiation that is produced carries a positive charge. The atomic number of the nucleus that decays decreases.The isotope 2712Mg has a half-life of 9.46 min. Determine the time interval (in min) required for the activity of a sample of this isotope to decrease to 37.0% of its original value. min