E (eV) (n + 1)p 7 (п + 1)s 5 620 nm пр 3 ns Ground state FIGURE Q29.22
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As shown the energy levels of a hypothetical atom.
a. What minimum kinetic energy (in eV) must an electron have to collisionally excite this atom and cause the emission of a 620 nm photon? Explain.
b. Can an electron with K = 6 eV cause the emission of 620 nm light from this atom? If so, what is the final kinetic energy of the electron? If not, why not?
c. Can a 6 eV photon cause the emission of 620 nm light from this atom? Why or why not?
d. Can a 7 eV photon cause the emission of 620 nm light from this atom? Why or why not?
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- The following are characteristics of the photoelectric effect: a. An incoming photon is totally absorbed by an inner shell electron. b. An atom is ionized when an electron is ejected from an orbital leaving a vacancy. C. An electron from outer shell fills a vacancy in an inner shell producing a characteristic X-ray. d. The characteristic photon can eject another electron called Auger electron. e. All of the above The main interaction responsible for diagnostic imaging is: Coherent scattering b. Compton effect C. Photoelectric effect d. Pair production4C. Electrons in one electron beam have a greater speed than those in another. Which electrons have the longer de Broglie wavelength? In your notes, use the appropriate formula to support your answer. ○ The relatively FASTER electron beam ○ The relatively SLOWER electron beam О The electron beams have the same de Broglie wavelength because they travel at the speed of lightA hydrogen atom is in state N= 3, where N = 1 is the lowest energy state. What is K+U in electron volts for this atomic hydrogen energy state? E3 = eV The hydrogen atom makes a transition to state N = 2. What is K+U in electron volts for this lower atomic hydrogen energy state? E₂ = eV What is the energy in electron volts of the photon emitted in the transition from level N = 3 to N = 2? Ephoton = eV
- Shown is the typical photoelectric behavior of a metal as the anode-cathode potential difference ΔV is varied.a. Why do the curves become horizontal for ΔV ≳ 1 V? Shouldn’t the current increase as the potential difference increases? Explain.b. Why doesn’t the current immediately drop to zero for ΔV < 0 V? Shouldn’t ΔV < 0 V prevent the electrons from reaching the anode? Explain.c. The current is zero for ΔV < -2.0 V . Where do the electrons go? Are no electrons emitted if ΔV 6 -2.0 V? Or if they are, why is there no current? Explain.C1The human eye is a complex detector for visible light. The optic nerve needs a minimum of 2.0 x 10-17 J of energy to trigger a series of impulses that eventually reach the brain. a. Find out the energy of a one photon of green light. (Wavelength of green light= 510 nm) b.How many photons of green light needed for the above process?
- 2. A photon has a frequency of 7.50 x 1014 Hz, a. Determine the energy and the momentum of this photon. b. If all the energy of this photon were to be converted to mass, determine the equivalent mass for the particle. c. A microscopic specimen has a wavelength of 8.2 × 10-14 m and a speed of 1.1 × 105 m/s. Determine the mass of this microscopic specimen.The first three energy levels of the fictitious element X are as shown.a. What wavelengths are observed in the absorption spectrum of element X? Give your answers in nm.b. State whether each of your wavelengths in part a corresponds to ultraviolet, visible, or infrared light.c. An electron with a speed of 1.4 × 106 m/s collides with an atom of element X. Shortly afterward, the atom emits a 1240 nm photon. What was the electron’s speed after the collision? Assume that, because the atom is so much more massive than the electron, the recoil of the atom is negligible.Calculate the de Broglie wavelength of the following items. m₂ = 9.11 x 10-3¹ kg mp+ = 1.67 x 10-27 kg melephant = 10 tonnes a. an electron travelling at 15 km s-¹? b. an electron with a kinetic energy of 1 eV? c. a proton travelling at 15 km s-¹? d. a proton with a kinetic energy of 1 eV?
- A photon with an energy of 3-eV is absorbed by a certain atom. Afterwards, three photons are spontaneously emitted. Which statement correctly describes the emitted photons? a.) The emitted photons each have the same wavelengths. b.) The photons are produced by a single electron energy-level transition. c.) The sum of the emitted photon energies equals 3 eV. d.) Three photons are always emitted when a 3-eV photon is absorbed.5.40x106 atoms are excited to an upper energy level at t = 0 s. At the end of 30.0 ns , 90.0% of these atoms have undergone a quantum jump to the ground state. You may want to review (Pages 1198 - 1200). Part A How many photons have been emitted? ΥΠ ΑΣφ ? photons Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Part B What is the lifetime of the excited state? ην ΑΣφ ? ns Submit Request AnswerPlease answer #1