I really need help with these questions. I will leave a good review when you are done

1. What is the energy (in Joules and ev) of a radio wave photon with a frequency of 100.7 MHz? (6.67 x 10-26 ], 4.17 x 10" eV ) 2. What is the energy of a photon of blue light which has a wavelength of 450 nm? (4.42 x 10-19 ]) 3. What is the frequency of a quantum of EMR whose energy is 1.0 MeV? What type of EMR is this? (2.4 x 1020 Hz) 4. A red neon laser has a wavelength of 632.8 nm. If the power of the laser is 1.50 mW, how many photons are being emitted per second? (4.77 x 1015) 5. A regular light bulb is about 5.0 % efficient in producing light energy from electrical energy. How many photons are released per second by a 50 watt light bulb if the average wavelength emitted is 500 nm? (6.3 x 101) 6. When prints are developed in a darkroom, a red light bulb may be used for certain types of film. Why does the red light not affect the photographic film? 7. What can you say about the relative temperatures of reddish, bluish, and whitish-yellow stars? 8. If all objects radiate energy, why can't we see them in the dark? 9. Describe what we mean by a "particle"; by a "wave." 10. What are the differences between electrons and photons? Be specific.Lesson 2: The photoelectric effect 11. Monochromatic light of wavelength 500 nm falls on a metal cathode to produce photoelectrons. The intensity of the light at the metal surface is 100 Joules/m/s. a. What is the energy of a single photon of this light? (3.98 x 10-" ]) b. How many photons fall on one square meter in one second? (2.51 x 10") c. If the cathode is a square which is 5.00 cm on a side, how many electrons are being released per second, assuming that every photon releases one photoelectron? How big a current would this produce? (6.28 x 10", 0.101 A) 12. For the photoelectric effect, explain what happens (and why): a. To the photocurrent as the light intensity increases. b. To the photocurrent as the frequency of the light is increased. c. To the speed of the photoelectrons as the radiation intensity increases. d. To the speed of the photoelectrons as the radiation frequency increases. 13. If the work function of a particular metal is 2.0 ev, what is the threshold frequency? (4.8 x 10* Hz) 14. What is the maximum wavelength of radiation that causes photoelectric emission from a surface whose work function is 4.6 ev? (2.7 x 10"m) 15. A material has a threshold frequency of 1300 THz and is exposed to radiation which has a wavelength of 170 nm. What is the maximum kinetic energy of the ejected electron? If light with a wavelength of 300 nm is used, what is the kinetic energy of the ejected electron? 16. A material has a work function of 2.55 ev. If electrons are being emitted with a speed of 4.20 x 10* m/s, what is the wavelength of the incident light? (407 nm) 17. Radiation with a frequency of 752 THz is used to illuminate a photoelectric surface. If the work function is 2.20 ev, what retarding voltage must be applied to reduce the photocurrent to zero? (0.916 V)