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Energy Change in Hydrogen & Energy of Photons (College)

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Energy Change in Hydrogen & Energy of Photons

1. 
Which of the following equations can be used to calculate changes in energy in a hydrogen atom?
  1. [math]∆E=2.178xx10^-18 J (1/n_f^2 - 1/n_i^2)[/math]
  2. [math]∆E=2.178xx10^-18 J (1/n_i^2 - 1/n_f^2)[/math]
  3. [math]∆E=-2.178xx10^-18 J (1/n_i^2 - 1/n_f^2)[/math]
  4. [math]∆E=-2.178xx10^-18 J (1/n_f^2 - 1/n_i^2)[/math]
2. 
Which of the following equations can be used to calculate the wavelength of an emitted photon?
  1. [math]lambda={∆E}/{hc}[/math]
  2. [math]lambda={∆E xx h}/{c}[/math]
  3. [math]lambda={hc}/{∆E}[/math]
  4. [math]lambda={∆E xx c}/{h}[/math]
3. 
What is the energy change involved in moving from n=6 to n=2?
  1. [math]4.84xx10^-19 J[/math]
  2. [math]-4.84 xx 10^-19 J[/math]
  3. [math]2.42 xx 10^-19 J[/math]
  4. [math]-2.42 xx 10^-19 J[/math]
4. 
What is the energy change involved in moving from n=3 to n=5?
  1. [math]1.549 xx 10^-19 J[/math]
  2. [math]-1.549 xx 10^-19 J[/math]
  3. [math]7.75 xx 10^-20 J[/math]
  4. [math]-7.75 xx 10^-20 J[/math]
5. 
What is the energy change involved in moving from n=1 to n=7?
  1. [math]-2.13 xx 10^-18 J[/math]
  2. [math]1.07 xx 10^-17 J[/math]
  3. [math]2.13 xx 10^-18 J[/math]
  4. [math]-1.07 xx 10^-17 J[/math]
6. 
What is the wavelength of an emitted photon, if the energy change associated with it is [math]2.1336xx10^-18 J[/math]?
  1. [math]1.07xx10^8 m[/math]
  2. [math]1.07xx10^7 m[/math]
  3. [math]5.035 xx 10^6 m[/math]
  4. [math]5.035 xx 10^7 m[/math]
7. 
What is the wavelength of an emitted photon, if the associated energy change is [math]4.84 xx 10^-19 J[/math]?
  1. [math]2.43 xx 10^6 m[/math]
  2. [math]2.43 xx 10^7 m[/math]
  3. [math]1.215 xx 10^6 m[/math]
  4. [math]1.216 xx 10^7 m[/math]
8. 
What is the wavelength of an emitted photon, if the associated energy change is [math]1.36xx10^-17 J[/math]?
  1. [math]6.84 xx 10^8 m[/math]
  2. [math]3.41 xx 10^7 m[/math]
  3. [math]6.84 xx 10^7 m[/math]
  4. [math]3.41 xx 10^8 m[/math]
9. 
Describe one limitation associated with the Bohr model, as is portrayed here for a hydrogen atom.



10. 
Explain what is implied by the sign (positive or negative) of the energy change, ∆E, involved in hydrogen atoms. Be sure to explain your answer, in terms of n.










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