PhysicsLAB Worksheet
Atomic Models and Spectra

1. Alpha particles were repelled by the atomic nucleus in Rutherford's gold foil experiment cause they are
 
2. Most of the alpha particles that were fired through the gold foil emerged un-deflected because they


 
3. A few of the alpha particles bounced backwards because they

 
4. Rutherford's experiment discovered that


 
5. True or False. Classical physicists were correct when they stated that electrons radiate energy as they accelerate around the nucleus within a single orbital.
 
6. Atoms are considered to be excited when


 
7. Which has the greatest energy with respect to the atomic nucleus?

 
8. Electrons emit light when they transition from a

 
9. The energy of the emitted photons is equal to the ____ in the energies between the two energy levels between which it is transitioning.
 
10. What is the name of the visible series in the hydrogen spectrum?
 
11. What formula is used to calculate the energy of a photon? 

12. Specifically, what does the letter "h" stand for in your answer to question #11? 

13. In your answer to question #11, what does "f" stand for? 

14. Which has a higher energy per photon?
 
15. When an accelerated electron in an electrified neon sign strikes one of the neon atoms,



 
16. True or False. The process of excitation and de-excitation described in question #15 can only occur once for each neon atom.
 
17. ____ is the idea that physical quantities come in discrete bundles - that is, nature is not continuous. For example, matter is a whole-number multiple of the mass of single atoms, electricity is a whole-number multiple of the charge of a single electron, radiation is a whole-number multiple of discrete bundles of radiant energy, photons. 

18. Which scientist first postulated that radiation comes in whole-number multiples of discrete bundles of radiant energy called photons?
 
19. Which scientist first postulated that light is only emitted by electrons during de-excitation?
 
20. Which scientist first recognized that stable electron orbitals are based on an integer multiple of the wavelength for an orbiting electron's standing wave.
 




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