A photon of wavelength of 1400Å is absorbed by an atom and two other photons are emitted. If one of these is an 1850Å, what is the (wavelength, of the second photon?
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- Suppose a 0.41 kg billiard ball has a wavelength of 7.8 cm. This wavelength is big enough so that the ball can interfere with other billiard balls. What is the velocity, in meters per second, or the Billard ball?The mathematical equation for studying the photoelectric effect is hν = W + 1/2 meu2 where ν is the frequency of light shining on the metal; W is the energy needed to remove an electron from the metal; and me and u are the mass and speed of the ejected electron, respectively. In an experiment, a student found that a maximum wavelength of 351 nm is needed to just dislodge electrons from a metal surface. Calculate the velocity (in m/s) of an ejected electron when the student employed light with a wavelength of 283 nm.(a) If the wavelength of an electron is 4.77 ✕ 10−7 m, how fast is it moving? ______ km/s (b) If the electron has a speed equal to 3.50 ✕ 106 m/s, what is its wavelength? ______m.
- You 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? VFor light with a wavelength of 350 nm and with an intensity of /= 10-8 W/m², what is the number of photons/(m²s) in the light beam?Light of wavelength > light. = 5.34 × 10¹¹m is incident on an electron and undergoes Compton scattering at an angle of 0 = 13.1° from the direction of the incident What is the magnitude of the momentum of the scattered photon? ×10-25 Js/m