A metal with a work function of 4.2 eV is exposed to light in a photoelectric effect experiment. If the light has frequency 1,505 THz, what is the kinetic energy of ejected electrons, in eV? Planck's constant is 4.136 x 10-15 eV s.
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A metal with a work function of 4.2 eV is exposed to light in a
Planck's constant is 4.136 x 10-15 eV s.
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- What is the de Broglie wavelength of a bullet of mass 0.075 kg traveling at 350 m/s? Planck's Constant is 6.63 × 10−34 J ⋅ s. a 4.1 × 10−35 m b 2.5 × 10−35 m c 2.2 × 10−34 m d 1.7 × 10−34 mAsap pleaseWhen ultraviolet light with a wavelength of 351 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.76x10-19 J. How much energy, in Joule, does an electron have to gain in order to escape from the metal surface? Exponential format with 3 SF.
- For a certain metal, the threshold wavelength for the photoelectric effect is 664.0 nm. What is the maximum velocity (in m/s) for ejected electrons when light with wavelength 464.0 nm shines on the metal?In a photoelectric experiment it is found that a stopping potential of 1.00 V is needed to stop all the electrons when incident light of wavelength 264 nm is used and 2.3 V is needed for light of wavelength 207 nm. From these data determine Planck's constant. (Enter your answer, in eV · s, to at least four significant figures.) eV s From these data determine the work function (in eV) of the metal. eVYou 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
- For 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?A hydrogen atom emits a photon that has momentum 6.977 × 10-27 kg·m/s. This photon is emitted because the electron in the atom falls from a higher energy level into the n = 1 level. What is the quantum number of the level from which the electron falls? Use values of h = 6.626 × 10-34 J·s, c = 2.998 × 108 m/s, and e = 1.602 × 10-19 C.You set up a photoelectric experiment with an unknown metal to eject electrons. You use light of wavelength =530nm, which just barely ejects electrons from the metal. Plank constant is either h=6.63*10^-34J.s or h=4.14*10^-15eV.s. a) what is the binding energy of the unknown metal in eV b)you change the light source to on with a wavelength of 340nm. 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 c)what is the stopping voltage of an electron with the kinetic energy you just found