Modern Physics Review Sheet _ 1. Which phenomena 1' experiment proves light is a particle? 2. What is a photon? 3. Which color of light has the greatest energy? Smallest energy? Why? 4. What is the energy of a photon with a frequency of 6.0 x10\" Hz ? 5. If the frequency of light is decreased how does that affect its energy? Show the equation that relates these 2 variables Sketch a plot of these 2 variables So} What is the relationship between the energy of a photon and its wavelength? Sketch a plot of these 2 variables 5. What is the relationship between the wavelength of a particle and its momentum? Sketch plot T. Why is it difcult to observe the wave behavior of a moving basketball? B. What did Rutherford's experiment tell us about the atom? 9. What does an electron in an atom have to do to lose energy? Go up - or - down an energy level. 9a} The lowest energy an electron can be in is celled the state. 10. How much energy does it take to ionize an electron of hydrogen in the 1st energy level? How much energy does it take to ionize an electron in the B level in mercury? 11. How much energy must an electron in hydrogen have to absorb to go from the 3rd to the 4th energy level? 12. What angle will an alpha particle come back at if it hits straight on? 12a} How will the deection angle change as an alpha particle comes closer to a nuclei? 13. Draw the path of an alpha particle that comes near the nucleus. Now draw the path of an alpha particle that comes closer to the nucleus. 14. What is an \"electron cloud" in the new model of the atoms? 15. What energy can an atom with the following energy levels absorb to change energy levels? 2El, - 15. - 2 {remember to remove the negatives before su btracting} 16. How many different amounts of energy can an atom with 3 energy levels emit? a} how many different colors? b} how many different photons