Modern Physics, Waves, Electricity

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Verity French
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1 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. What is the current reading of ammeter 1? D elementary charges. +2 elementary charges. +14 elementary charges D. +28 elementary charges 5. The accompanying diagram represents a periodic wave. 2. Which net charge could be found on an object? D Which two points on the wave are in phase?. and D. and G. and K D. D and I 3. ase your answer(s) to the following question(s) on the diagram below, which shows two resistors and three ammeters connected to a voltage source. 6. What are the amplitude and wavelength of the wave shown?. amplitude = 0.10 m, wavelength = 0.30 m. amplitude = 0.10 m, wavelength = 0.60 m What is the potential difference across the source?. 440 V. 220 V. 120 V D. 60. V. amplitude = 0.20 m, wavelength = 0.30 m D. amplitude = 0.20 m, wavelength = 0.60 m page 1

2 7. The accompanying diagram shows a ray of light passing through two media. 9. Which diagram below best represents the phenomenon of diffraction?.. When the wave travels from medium into medium, its speed.. decreases. increases. remains the same D. 8. The accompanying diagram represents a rope along which two pulses of equal amplitude,, approach point P. s the two pulses pass through point P, the maximum vertical displacement of the rope at point P will be 10. ase your answer(s) to the following question(s) on the information below hertz radio signal is sent a distance of meters from Earth to a spaceship orbiting Mars. pproximately how much time does it take the radio signal to travel from Earth to the spaceship? D s s s D s page 2

11. Which graph best represents the electrostatic force between an alpha particle with a charge of +2 elementary charges and a positively charged nucleus as a function of their distance of separation?

3 11. Which graph best represents the electrostatic force between an alpha particle with a charge of +2 elementary charges and a positively charged nucleus as a function of their distance of separation?. 13. Experiments performed with light indicate that light exhibits. particle properties, only. wave properties, only. both particle and wave properties D. neither particle nor wave properties. 14. ase your answer(s) to the following question(s) on the cartoon below and your knowledge of physics.. D. In the cartoon, Einstein is contemplating the equation for the principle that. the fundamental source of all energy is the conversion of mass into energy 12. What is the energy of a quantum of light having a frequency of hertz? J J J D J. energy is emitted or absorbed in discrete packets called photons. mass always travels at the speed of light in a vacuum D. the energy of a photon is proportional to its frequency page 3

4 15. fter electrons in hydrogen atoms are excited to the n = 3 energy state, how many different frequencies of radiation can be emitted as the electrons return to the ground state? 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 16. What type of nuclear force holds the protons and neutrons in an atom together?. a strong force that acts over a short range. a strong force that acts over a long range. a weak force that acts over a short range D. a weak force that acts over a long range 17. photon is emitted as the electron in a hydrogen atom drops from the n = 5 energy level directly to the n = 3 energy level. What is the energy of the emitted photon? ev ev ev D ev 20. particle that is composed of two up quarks and one down quark is a. meson. neutron. proton D. positron 18. On the atomic level, energy and matter exhibit the characteristics of. particles, only. waves, only. neither particles nor waves D. both particles and waves page 4

5 21. Which graph best represents the relationship between photon energy and photon frequency?. 23. ase your answer(s) to the following question(s) on the statement below. The spectrum of visible light emitted during transitions in excited hydrogen atoms is composed of blue, green, red, and violet lines. Which color of light in the visible hydrogen spectrum has photons of the shortest wavelength?.. blue. green. red D. violet. 24. Which type of photon is emitted when an electron in a hydrogen atom drops from the n = 2 to the n = 1 energy level? D.. ultraviolet. visible light. infrared D. radio wave 22. fter Rutherford bombarded gold foil with alpha particles, he concluded that the volume of an atom is mostly empty space. Which observation led Rutherford to this conclusion?. Some of the alpha particles were deflected ll photons in a vacuum have the same. speed. wavelength. energy D. frequency. The paths of deflected alpha particles were hyperbolic.. Many alpha particles were absorbed by gold nuclei. D. Most of the alpha particles were not deflected. page 5

6 26. ase your answer(s) to the following question(s) on the data table below. The data table lists the energy and corresponding frequency of five photons. Photon Energy (J) Frequency (Hz) D E In which part of the electromagnetic spectrum would photon D be found?. infrared. visible. ultraviolet D. x ray 29. How much energy is released when kilograms of matter is converted to energy? J J J D J 30. ase your answer(s) to the following question(s) on the information below. mercury atom makes a direct transition from energy level e to energy level b. Determine the energy, in electronvolts, given off in the transition. 27. The accompanying chart lists the rest masses of two particles and a nucleus in atomic mass units. 31. What is the energy of the emitted photon in joules? proton neutron u u 6Li nucleus u 3 What is the mass defect of a 6 Li nucleus? u u 32. Determine the frequency of the radiation corresponding to the emitted photon. [Show all calculations, including the equation and substitution with units u D u 28. Which statement is true of the strong nuclear force? 33. Explain what would happen if a 4.50-electronvolt photon were incident on a mercury atom in the ground state.. It acts over very great distances.. It holds protons and neutrons together.. It is much weaker than gravitational forces. D. It repels neutral charges. 34. What prevents the nucleus of a helium atom from flying apart? page 6

7 35. ase your answer(s) to the following question(s) on the information and diagram below. monochromatic beam of yellow light,, is incident upon a Lucite block in air at an angle of ase your answer(s) to the following question(s) on the information below. photon with a wavelength of meter strikes a mercury atom in the ground state. alculate the energy, in joules, of this photon. [Show all work, including the equation and substitution with units.] 39. Determine the energy, in electronvolts, of this photon. 40. ased on your answer to the question above, state if this photon can be absorbed by the mercury atom. Explain your answer. alculate the angle of refraction for incident beam. [Show all work, including the equation and substitution with units.] 41. ase your answer(s) to the following question(s) on the diagram below, which shows some energy levels for an atom of an unknown substance. 36. ompare the speed of the yellow light in air to the speed of the yellow light in Lucite. 37. Determine the color of a ray of light with a wavelength of meter. Determine the minimum energy necessary for an electron to change from the energy level to the F energy level. page 7

8 42. alculate the frequency of the photon emitted when an electron in this atom changes from the F energy level to the energy level. [Show all work, including the equation and substitution with units.] page 8

9 Problem-ttic format version c Educide Software Licensed for use by phelipedfernandes@gmail.com Terms of Use at 5/17/ D D ev J E = hf f = Hz Nothing will happen. The photon will not be absorbed. The mercury atom will remain in the ground state D The strong force or the strong nuclear force prevents the nucleus of a helium atom from flying apart. 21 Light travels faster in air than in Lucite orange

10 Teacher s Key Page E photon = hc λ, E photon = J 5.43eV the photon can be absorbed and the energy of the photon is exactly equal to the energy-level difference between the ground state and level d J Hz

1. What is the minimum energy required to excite a mercury atom initially in the ground state? ev ev ev

Page 1 of 10 modern bank Name 25-MAY-05 1. What is the minimum energy required to excite a mercury atom initially in the ground state? 1. 4.64 ev 3. 10.20 ev 2. 5.74 ev 4. 10.38 ev 2. The diagram represents