Modern Physics What is the approximate length of a baseball bat? A m B m. C m D m

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1 Modern Physics 2017 Name: Date: 1. What is the approximate length of a baseball bat? m m 6. The diagram below represents the bright-line spectra of four elements,,,, and D, and the spectrum of an unknown gaseous sample m D m 2. What is the approximate mass of an automobile? kg kg kg D kg 3. ll photons in a vacuum have the same. speed. wavelength. energy D. frequency 4. Which phenomenon best supports the theory that matter has a wave nature?. electron momentum. electron diffraction. photon momentum D. photon diffraction 5. Which pair of quantities can be expressed using the same units?. work and kinetic energy. power and momentum. impulse and potential energy D. acceleration and weight ased on comparisons of these spectra, which two elements are found in the unknown sample?. and. and D. and D. and D 7. Which type of photon is emitted when an electron in a hydrogen atom drops from the n = 2 to the n = 1 energy level?. ultraviolet. visible light. infrared D. radio wave 8. photon having an energy of 9.40 electronvolts strikes a hydrogen atom in the ground state. Why is the photon not absorbed by the hydrogen atom?. The atom s orbital electron is moving too fast.. The photon striking the atom is moving too fast.. The photon s energy is too small. D. The photon is being repelled by electrostatic force. page 1

2 9. photon of light traveling through space with a wavelength of meter has an energy of 14. ccording to the Standard Model of Particle Physics, a meson is composed of J J J D J 10. Light demonstrates the characteristics of. particles, only. waves, only. both particles and waves D. neither particles nor waves 11. The energy of a sound wave is most closely related to its. period. amplitude. frequency D. wavelength. a quark and a muon neutrino. a quark and an antiquark. three quarks D. a lepton and an antilepton 15. lithium atom consists of 3 protons, 4 neutrons, and 3 electrons. This atom contains a total of. 9 quarks and 7 leptons. 12 quarks and 6 leptons. 14 quarks and 3 leptons D. 21 quarks and 3 leptons 16. What fundamental force holds quarks together to form particles such as protons and neutrons? 12. The slope of a graph of photon energy versus photon frequency represents. Planck s constant. the mass of a photon. the speed of light D. the speed of light squared. electromagnetic force. gravitational force. strong force D. weak force 17. What is the total number of quarks in a helium nucleus consisting of 2 protons and 2 neutrons? 13. tritium nucleus is formed by combining two neutrons and a proton. The mass of this nucleus is universal mass unit less than the combined mass of the particles from which it is formed. pproximately how much energy is released when this nucleus is formed? MeV MeV MeV D. 273 MeV D The energy produced by the complete conversion of kilogram of mass into energy is. 1.8 TJ. 6.0 GJ. 1.8 MJ D. 6.0 kj 19. aryons may have charges of. +1e and ge. +2e and +3e. 1e and +1e D. 2e and 2 3 e page 2 Modern Physics 2017

3 20. helium atom consists of two protons, two electrons, and two neutrons. In the helium atom, the strong force is a fundamental interaction between the. electrons, only. electrons and proton. neutrons and electrons D. neutrons and proton 21. What total mass must be converted into energy to produce a gamma photon with an energy of joule? D ompared to the mass and charge of a proton, an antiproton has. the same mass and the same charge. greater mass and the same charge. the same mass and the opposite charge D. greater mass and the opposite charge 23. Determine the frequency of a photon whose energy is joule. 24. If a proton were to combine with an antiproton, they would annihilate each other and become energy. alculate the amount of energy that would be released by this annihilation. [Show all work, including the equation and substitution with units.] 25. ase your answer(s) to the following question(s) on the passage below and on your knowledge of physics. More Sci- Than Fi, Physicists reate ntimatter Physicists working in Europe announced yesterday that they had passed through nature s looking glass and had created atoms made of antimatter, or antiatoms, opening up the possibility of experiments in a realm once reserved for science fiction writers. Such experiments, theorists say, could test some of the basic tenets of modern physics and light the way to a deeper understanding of nature. y corralling [holding together in groups] clouds of antimatter particles in a cylindrical chamber laced with detectors and electric and magnetic fields, the physicists assembled antihydrogen atoms, the looking glass equivalent of hydrogen, the most simple atom in nature. Whereas hydrogen consists of a positively charged proton circled by a negatively charged electron, in antihydrogen the proton s counterpart, a positively charged antiproton, is circled by an antielectron, otherwise known as a positron. ccording to the standard theories of physics, the antimatter universe should look identical to our own. ntihydrogen and hydrogen atoms should have the same properties, emitting the exact same frequencies of light, for example.... ntimatter has been part of physics since 1927 when its existence was predicted by the ritish physicist Paul Dirac. The antielectron, or positron, was discovered in ccording to the theory, matter can only be created in particle-antiparticle pairs. It is still a mystery, cosmologists say, why the universe seems to be overwhelmingly composed of normal matter. Dennis Overbye, More Sci- Than Fi, Physicists reate ntimatter, New York Times, Sept. 19, 2002 The author of the passage concerning antimatter incorrectly reported the findings of the experiment on antimatter. Which particle mentioned in the article has the charge incorrectly identified? 26. How should the emission spectrum of antihydrogen compare to the emission spectrum of hydrogen? page 3 Modern Physics 2017

4 27. Identify one characteristic that antimatter particles must possess if clouds of them can be corralled by electric and magnetic fields. 35. ased on your calculated value of the frequency of the absorbed photon, determine its classification in the electromagnetic spectrum. 28. ccording to the article, why is it a mystery that the universe seems to be overwhelmingly composed of normal matter? 29. ase your answer(s) to the following question(s) on the information below. photon with a frequency of hertz is absorbed by an excited hydrogen atom. This causes the electron to be ejected from the atom, forming an ion. alculate the energy of this photon in joules. [Show all work, including the equation and substitution with units.] 30. Determine the energy of this photon in electronvolts. 31. What is the number of the lowest energy level (closest to the ground state) of a hydrogen atom that contains an electron that would be ejected by the absorption of this photon? 32. ase your answer(s) to the following question(s) on the information below. s a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e Determine the energy of the absorbed photon in electronvolts. 33. Express the energy of the absorbed photon in joules. 34. alculate the frequency of the absorbed photon. [Show all work, including the equation and substitution with units.] 36. fter a uranium nucleus emits an alpha particle, the total mass of the new nucleus and the alpha particle is less than the mass of the original uranium nucleus. Explain what happens to the missing mass. 37. n FM radio station broadcasts its signal at a frequency of hertz. Determine the wavelength of the signal in air. 38. ase your answer(s) to the following question(s) on the Energy Level Diagram for Hydrogen in the Reference Tables for Physical Settings/Physics. a) Determine the energy, in electronvolts, of a photon emitted by an electron as it moves from the n = 6 to the n = 2 energy level in a hydrogen atom. b) onvert the energy of the photon to joules. c) alculate the frequency of the emitted photon. [Show all work, including the equation and substitution with units.] d) Is this the only energy and/or frequency that an electron in the n = 6 energy level of a hydrogen atom could emit? Explain your answer. 39. onvert the energy of the photon to joules. 40. alculate the frequency of the emitted photon. [Show all work, including the equation and substitution with units.] 41. Is this the only energy and/or frequency that an electron in the n = 6 energy level of a hydrogen atom could emit? Explain your answer. page 4 Modern Physics 2017

5 Problem-ttic format version c Educide Software Licensed for use by phelipedfernandes@gmail.com Terms of Use at D D Modern Physics /17/ Hz antiproton - identical - the same identify charge as one characteristic that antimatter particles must possess. - lthough matter is only created in matter-antimatter pairs, most matter is normal. - matter, not antimatter - It should be balanced by antimatter. - Matter can only be created in particle-antiparticle pairs ev 31. n = ev J Hz Infrared

6 Teacher s Key Page mass is converted into energy m or 3.3 m ev; J; f = 7.29x10 14 Hz; No, the n = 6 level can return to any of the 5 lower energy levels J f = 7.29x10 14 Hz No, the n = 6 level can return to any of the 5 lower energy levels.

Modern Physics, Waves, Electricity

Modern Physics, Waves, Electricity Name: Date: 1. Metal sphere has a charge of +12 elementary charges and identical sphere has a charge of +16 elementary charges. fter the two spheres are brought into contact, the charge on sphere is 4.