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Physics Worksheet Lesson 27 Quantum Physics, Exercises of Quantum Mechanics

California Institute of Technology (Caltech)Quantum Mechanics

Material Waves. 10. All matter have . The wavelength of a particle is called . ( = .) Wavelength depends on. and. , and is only.

Typology: Exercises

2022/2023

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Physics'Worksheet'''''''' ' '''''Quantum'Physics''''''''''''Section:'''''''Name:''
!
! ! ! Mr.$Lin$
1$
The Planetary Model of Atom
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1. Describe Niels Bohr’s atomic model!!
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(1) _____________________________________________________.!
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(2) _____________________________________________________.!
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(3) _____________________________________________________.!
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(4) _____________________________________________________.!
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2. What’s the problem of Niels Bohr’s atomic model?!!
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_________________________________________________________.!
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What’s the experimental result?
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_________________________________________________________.!
Describe the Balmer Series of emission spectrum?
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_________________________________________________________.!
Describe the electron orbits of the hydrogen atom:
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(1) _____________________________________________________.!
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(2) _____________________________________________________.!
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(3) _____________________________________________________.!
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(4) _____________________________________________________.!
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(5) _____________________________________________________.!
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(6) _____________________________________________________.!
3. Strength and weakness of Bohr’s atomic model:!!
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Strength: _______________________________________________.!
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Weakness: ______________________________________________.!
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Models of Light
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4. Summarize the contributions of physicists to the model
of light:!!
Newton: ________________________________________________.!
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Huygens: _______________________________________________.!
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Young: _________________________________________________.!
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Maxwell: _______________________________________________.!
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Hertz: __________________________________________________.!
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Einstein: _______________________________________________.!
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Light Quanta
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5. Planck believed that light existed as continuous waves.
However, he proposed that atoms emit and absorb light !
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in little chunks – ___________________.!
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Einstein proposed that light itself is composed of
________________ (also called _________________.)
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A ___________ is an elementary unit of something.
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List quantized physical quantities: ________________ '
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_________________________________________________________.!
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Photons
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6. Summarize the properties of photons:!!
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(1) _____________________________________________________.!
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(2) _____________________________________________________.!
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(3) _____________________________________________________.!
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(4) _____________________________________________________.!
7. What!is! the!photoelectric$effect?! Summarize! it! in! the!
following!points:!
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(1) _____________________________________________________.!
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(2) _____________________________________________________.!
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(3) _____________________________________________________.!
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(4) _____________________________________________________.!
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(5) _____________________________________________________.!
Waves vs. Particles
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8. Light travels as a __________________. Light interacts !
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with matters as a _______________________________.!
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9. When!electron!beam!is!directed!toward!a!crystal,!!!
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_______________________________________________!is!observed.!
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Electrons!behave!like!a!_________________________.!
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De!Broglie! suggested! that!_______________________________!
have!wave!properties.!It!is!so!called!!!
!
_____________________________________________________________.!
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Download Physics Worksheet Lesson 27 Quantum Physics and more Exercises Quantum Mechanics in PDF only on Docsity!

The Planetary Model of Atom

  1. Describe Niels Bohr’s atomic model (1) _____________________________________________________. (2) _____________________________________________________. (3) _____________________________________________________. (4) _____________________________________________________.
  2. What’s the problem of Niels Bohr’s atomic model? _________________________________________________________. What’s the experimental result? _________________________________________________________. Describe the Balmer Series of emission spectrum? _________________________________________________________. Describe the electron orbits of the hydrogen atom: (1) _____________________________________________________. (2) _____________________________________________________. (3) _____________________________________________________. (4) _____________________________________________________. (5) _____________________________________________________. (6) _____________________________________________________.
  3. Strength and weakness of Bohr’s atomic model: Strength: _______________________________________________. Weakness: ______________________________________________. Models of Light
  4. Summarize the contributions of physicists to the model of light: Newton: ________________________________________________. Huygens: _______________________________________________. Young: _________________________________________________. Maxwell: _______________________________________________. Hertz: __________________________________________________. Einstein: _______________________________________________. Light Quanta 5. Planck believed that light existed as continuous waves. However, he proposed that atoms emit and absorb light in little chunks – ___________________. Einstein proposed that light itself is composed of ________________ (also called _________________.) A ___________ is an elementary unit of something. List quantized physical quantities: ________________ _________________________________________________________. Photons 6. Summarize the properties of photons: (1) _____________________________________________________. (2) _____________________________________________________. (3) _____________________________________________________. (4) _____________________________________________________. 7. What is the photoelectric effect? Summarize it in the following points: (1) _____________________________________________________. (2) _____________________________________________________. (3) _____________________________________________________. (4) _____________________________________________________. (5) _____________________________________________________. Waves vs. Particles 8. Light travels as a __________________. Light interacts with matters as a _______________________________. 9. When electron beam is directed toward a crystal, _______________________________________________ is observed. Electrons behave like a _________________________. De Broglie suggested that _______________________________ have wave properties. It is so called _____________________________________________________________.

Material Waves

  1. All matter have _________________. The wavelength of a particle is called ____________________________. (𝜆 = _________________________.) Wavelength depends on _____________________ and _____________________, and is only detectable in light particles such as ____________________.
  2. Example : A football’s weight is 0.4 kg and the speed is 30 m/s. Calculate the wavelength of the football
  3. Example : Calculate the de Broglie wavelength of an electron traveling at 2% the speed of light.
  4. Example : Calculate the de Broglie wavelength of an ball traveling at 330 m/s.
  5. Why electron microscope can “see” details not possible with optical microscopes? ______________________________________________. Electron Waves_
  6. The Bohr’s model failed to explain why _____________________________________________. This can be resolved by viewing ______________________________________________._
  7. de Broglie proposed that electrons in an atom form ____________________ around the nucleus. The circumferences of an electron’s orbits equaled _____________________________________________. Relative Sizes of Atoms
    1. Summarize the relative sizes of atoms: (1) _____________________________________________________. (2) _____________________________________________________. (3) _____________________________________________________. (4) _____________________________________________________. Atomic Energy Levels & Photon Energy
  1. Calculate the wavelength of photons for the transitions form n = 4 to n = 2 in a hydrogen atom.
  2. Identify the type of photons for the transitions form n = 4 to n = 2 in a hydrogen atom. Solving Energy Level Problems
  3. Steps of solving Energy Level Problems (1) What are the resources available in the reference table? (2) How to calculate the energy of photon emitted by an electron changing its energy level? (3) How to convert eV to Joule? (4) How to calculate the frequency of an emitted photon? (5) How to calculate the wavelength of an emitted photon? (6) How to identify the type of a photon? Quantum Physics
    1. _____________________________ is for macroworld. _____________________________ is for microworld.
    2. Measurement in the macroworld is based on _______________. Measurement in the microworld is based on _______________. Heisenberg Uncertainty Principle
    3. Heisenberg showed that the product _______________ is always greater than ________________, where ________ is the position uncertainty. ________ is the momentum uncertainty.

June 2010 Base your answers to questions 72 through 75 on the information below. As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. 72 Determine the energy of the absorbed photon in electronvolts. [ 1 ] 73 Express the energy of the absorbed photon in joules. [ 1 ] 74 Calculate the frequency of the absorbed photon. [ Show all work, including the equation and substitution with units. ] [ 2 ] 75 Based on your calculated value of the frequency of the absorbed photon, determine its classification in the electromagnetic spectrum. [ 1 ] June 2009 Base your answers to questions 70 through 72 on the information below. A photon with a frequency of 5.48 × 1014 hertz is emitted when an electron in a mercury atom falls to a lower energy level. 70 Identify the color of light associated with this photon. [ 1 ] 71 Calculate the energy of this photon in joules. [ Show all work, including the equation and substitution with units.] [ 2 ] 72 Determine the energy of this photon in electronvolts. [ 1 ] January 2008 Base your answers to questions 75 and 76 on the information below. In a mercury atom, as an electron moves from energy level i to energy level a , a single photon is emitted. 75 Determine the energy, in electronvolts, of this emitted photon. [1] 76 Determine this photon’s energy, in joules. [1]

  • June