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6. Batteries operating a flashlight produce a current of 1.75 A in a light bulb that has a resistance of 4 ohms. The voltage of the battery is 7 volts about 2.3 volts 5.75 volts 2.25 volts 7. The number of protons in a nucleus is the mass number neutron number atomic number isotope number 8. The total number of particles (nucleons) in a nucleus is the mass number neutron number atomic number isotope number quantum number 9. A radioactive isotope has a half-life of 3 hours. If there are initially 10,000 nuclei present, after 6 hours have elapsed the number of nuclei of that isotope remaining will be (a) 10,000 (b) 5,000 (c) 2,500 (d) 7,500 10. An object is placed to the left of and farther from a converging lens than the focal length. The resulting image will be a) real and upright and to the right of the lens b) virtual and upright and to the left of the lens c) real and inverted and to the left of the lens d) real and inverted and to the right of the lens e) virtual and inverted and to the left of the lens 1 1. An object free falls from rest for 5.0 s. What is the object's velocity at 5.0 s? g = 9.8 m/s2. 12. An object is 15.0 cm tall and its image is 45.0 cm tall. What is the magnification? No credit if you use the wrong equation or if you write the wrong sign. Careful of the wording! Page 4