LIGHT PROBLEMS!
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What is the frequency of a light wave with a wavelength of 410 nm/wave?
What is the energy of a quantum or wave of light of frequency 4.31 x 1014 Hz?
What is the wavelength of light with frequency 6.62 x 1014 Hz?
What is the energy of a light wave with wavelength 662 nm/wave?
The Rams football game on Sunday was broadcast on 550 KHz, KTRS.
Calculate the wavelength of this light wave.
6. Calculate the energy of a photon of a KTRS light wave from number 5.
7. What would be the wavelength of light necessary to cause electrons to leave
the surface of a substance with an energy of 1.20 x 10-19 J?
8. A certain violet light has a wavelength of 413 nm/wave. What is its frequency?
9. A certain green light has a frequency of 6.26 x 1014 Hz. What is its wavelength?
10. What is the energy content of one quantum or wave of the light in problem 8?
11. What is the energy content of one quantum or wave of the light in problem 9?
12. Calculate the wavelength of your favorite FM radio station. FM radio stations broadcast light waves in
megahertz (MHz).
13. Calculate the energy of a photon or light wave of your favorite radio station.
14. Radio station C-LOVE is located at 1460 on the AM band; this means that C-LOVE broadcasts at 1460
kHz (1460 x103 Hz). What is the wavelength of a C-LOVE radio wave, and the energy of a C-LOVE
photon?
15. Typical X-rays have a wavelength of 0.01 nm/wave. What is the energy of one of the X-ray photons?
16. How much energy does a 1.00 cm/wave microwave possess, used to cook a hot dog?
17. How many visible light waves travel through your body in one second, if visible light has a wavelength
of 7.00 x 10-7 meters?
18. How much energy does a red light photon possess? It travels on a wave that has a wavelength of 600.0
nanometers.
19. What is the wavelength of a microwave that can cook with energy equal to 1.986 x 10-23 Joules?
20. What is the frequency of a wave that has a wavelength of 420.0 nanometers/wave? What color is the
light wave?
21. What is the wavelength of a wave that travels through you 3.00 x 1019 times in one second?
22. An infrared wave has how much energy, if it has a wavelength of 1.00 x 10-6 meters/wave?
23. A blue light has a wavelength of 450.0 nm. How much energy does a photon of blue light have?
24. Calculate the energy released by an electron that experiences an n=6 to n=4 quantum drop in a hydrogen
atom.
25. What wavelength of light would an electron emit in a hydrogen atom if it experienced a drop from
quantum state 5 to quantum state 2? Would this light be visible? Explain!
26. What is the frequency of a photon emitted from an electron going from quantum state 7 to quantum state
2 in a hydrogen atom?
27. In a hydrogen atom, how much energy does an electron at n=5 possess?
28. An electron in a sodium atom emitted a photon with a wavelength of 589 nm. What is the energy
difference in energy levels?
29. Calculate the shortest wavelength of the electromagnetic radiation emitted by the hydrogen atom in
undergoing a transition from the n=6 level.
30. What color of light has an energy of 2.65 x 10-19 J? What is its wavelength in nm?
31. A certain medical device designed to kill infection excites hydrogen electrons to n=8, and then causes
them to fall to n=1. Calculate the wavelength of light that is emitted by the device. What type of energy
is this? Is it visible?
32. What energy level is an electron at if it possesses energy equal to 5.45 x 10-19 J in a hydrogen atom?
33. What is the final energy level that an electron in a hydrogen atom arrives at if it emits a wavelength of
light equal to 1.094 x 10-6 m, and it starts at n=6 quantum level?
34. Calculate the frequency of a photon emitted as an electron moves from n=5 quantum level to n=1
quantum level in a hydrogen atom.
35. An electron in a hydrogen atom at quantum level 2 is hit with a photon of red light that has a wavelength
of 656 nm. What quantum level does it move to?
36. Calculate the frequency of light emitted from a hydrogen atom that has an n=6 to n=2 electron drop.
37. Experimentally calculate the speed of light if an electron in a hydrogen atom drops from n = 5 to n = 1
and releases a photon of light. It has a wavelength of 95.1 nm.
38. What is the exact energy for an electron in the n=4 quantum level of a hydrogen atom?
39. What is the difference in energy levels in a titanium atom if an electron dropping between those energy
levels releases light that has a wavelength of 3.45 x 10-9m?
40. What is the energy of a photon that is released as an electron in a hydrogen atom goes from n=5 to n=3?
What type of light is emitted?
41. A ruby laser uses a ruby crystal to generate energy. It has its red color due to chromium atoms that are
present. If an electron in a chromium atom is excited with 545 nm of light to create the laser effect,
what is the difference in energy between the two energy levels that the electron is traveling?