FA27.1 - Photons
Get the formative assessment: FA27.1.docx
Get more practice problems: Worksheet-ProblemsFrom27.1.docx
The formative assessment solved:
1.
What is the wavelength of a 150. kHz radio wave?
(2.00x103 m)
What is the frequency of a 2.00 m radio wave?
(1.5 x 108 Hz)
2.
What is the wavelength of a 1.80 eV photon?
(689 nm)
What is the energy in electron volts of a 150. nm photon?
(8.27 eV)
3.
400. nm light ejects photo-electrons from a metal that have a stopping potential of 1.17 V. What is the work function of the metal in electron volts?
(1.93 eV)
What wavelength of light would eject photo electrons with a stopping potential of 2.60 V?
(274 nm)
4. A photon creates an electron/positron pair each having 0.211 MeV of kinetic energy. What is the wavelength of the photon?
(8.59x10-13 m)
5. What is the velocity of an electron with a wavelength of 12.0 nm?
(6.06 x 104 m/s)
Problems from 27.1 - Photon Theory
1. What is the frequency of a 3.00 m long radio wave? (1.00x108 Hz)
2. What is the frequency of a 400. nm light wave? (7.50x1014 Hz)
3. What is the frequency of a 12.0 cm microwave? (2.50x109 Hz)
4. What is the wavelength of a 91.1 MHz FM radio wave? (3.29 m)
5. What is the wavelength of a 60.0 Hz radio wave? (5.00x106 m)
6. What is the wavelength of a 2.13 eV photon? (583 nm)
7. What is the energy in eV of a 400. nm light wave? (3.10 eV)
8. What is the energy in eV of a 700. nm light wave? (1.77 eV)
9. What is the wavelength of a 1.20 MeV photon? (1.03x10-12 m)
10. What is the energy of a 0.00130 nm photon in eV? (9.54x105 eV)
11. 415 nm light ejects photo-electrons from a metal with a work function of 2.06 eV. What is the stopping potential of the photo-electrons? (0.930 V)
12. 213 nm light ejects photo-electrons from a metal with a work function of 3.10 eV. What is the kinetic energy of the photo-electrons in eV? (2.73 eV)
13. 117. nm light ejects photo-electrons that have a stopping potential of 3.56 V from a metal. What is the work function of the metal in electron volts? (7.05 eV)
14. Light ejects photo-electrons that have a stopping potential of 1.17 V from a metal with a work function of 2.36 eV. What is the wavelength of the light? (352 nm)
15. 315 nm light ejects photo-electrons from a metal that have a stopping potential of 2.65 V. What is the work function of the metal in electron volts? (1.29 eV)
16. A photon creates a proton/anti proton pair each with 180. MeV of kinetic energy. What is the maximum wavelength the photon could have? (5.55x10-16 m)
17. A photon with a wavelength of 7.21x10-13 m creates an electron/positron pair each with what maximum kinetic energy? (0.349 MeV)
18. A photon creates an electron/positron pair each with 3.20 MeV of energy. What is its wavelength? (1.67x10-13 m)
19. A 5.85x10-16 m photon creates a neutron/anti neutron pair each with what kinetic energy? (121 MeV)
20. A 3.20x10-15 m photon creates a charged matter/anti matter pair each having a kinetic energy of 53.9 MeV. What is the rest mass of the particles created in MeV? (140. MeV)
¬This is not in the data packet
21. What is the velocity of a proton with a de Broglie wavelength of 450. nm? (0.880 m/s)
22. What is the mass of a particle that has a de Broglie wavelength of 926 nm, and a velocity of 0.265 m/s? (2.70x10-27 kg)
23. What is the de Broglie wavelength of an electron with a velocity of 1750 m/s? (416 nm)
24. What is the velocity of proton with a de Broglie wavelength of 1.00 x 10-10 m? (3.96x103 m/s)
25. A particle going 1200. m/s has a de Broglie wavelength of 137 nm. What is the mass of the particle? (4.03x10-30 kg)
The instruction for this unit:
