a laser produces a short pulse of light whose energy equals 0.20 J. The wavelength of the light is 694 nm. a) How many photons are produces? b) Determine the total momentum of the emitted light pulse
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- 1. A light beam of wavelength 679 nm and intensity 156 W/m^2 shines on a target of area 2.91 m^2 for a duration of 3.64 s. How many photons from the light beam will have struck the target during this time? 3.96E+21 7.91E+21 9.04E+21 5.65E+21An electron is fired at a metal target, reaching a speed of 1.00 x 106 m/s. On impact, it rapidly decelerates to half that speed, emitting a photon in the process. Calculate the energy and the wavelength of the photon.C2. A photon having energy Eo= 0.880 MeV is scattered by a free electron initially at rest such that the scattering angle of the scattered electron is equal to that of the scattered photon as shown in the figure below. (a) Determine the scattering angles (in degree) of the photon and the electron. (b) Determine the wavelength (in nm) of the scattered photon. (c) Determine the kinetic energy (in keV) of the scattered electron. Express the values to 3 significant figures, if necessary. Figure C2
- Energy مثل n=3 n = 2 n=1 مشا R A photon Pis absorbed by an electron in the ground state, and it jumps up to the n=3 energy level. It then quickly emits two photons, Q and R, as the electron returns to the ground state. What are the frequencies of these three photons P, Q, and R?An x-ray of strikes a free electron and scatters with a wavelength of 0.1252 nm at 60.0°. a. What is the wavelength of the incident photon (from the x-ray source)? b. Calculate the wavelength of an x-ray that is scattered at 30.0° scattered photon incident photon target electron scattered electronYou set up a photoelectric experiment with an unknown metal to eject electrons. You use light of wavelength λ = 670 nm, which just BARELY ejects electrons from the metal. Planck□s constant is either h = 6.63 x 10-34 J-s or h = 4.14 x 10-15 ev.s. a) What is the binding energy of the unknown metal in eV? ev b) You change the light source to one with a wavelength of λ = 310 nm. Using the binding energy you found in the previous step, find the maximum kinetic energy of an electron that is ejected from the metal in Joules. J c) What is the stopping voltage for an electron with the kinetic energy you just found? V
- Photons of wavelength 248.6 nm strike a metal whose work function is 3.5 eV. What is the KE of the most energetic photoelectron? a) 1.5 eV b) 2.5 eV c) 3.5 eV d) none of these.Determine the wavelength of an electron that has a kinetic energy of 1.15 × 10 J. Report your answer in units of nm.A metal has a work function of 3.1eV and is illuminated by light of wavelength A = 320 nm. What is the maximum velocity of the photoelectrons emitted? Select one: а. 2.7 x 106 m/s b. 3.2 x 10' m/s С. 5.9 x 105 m/s O d. 5.24 x 105 m/s