A photon of wavelength 400 nanometers has fallen on the surface of a metal with a work function of 2.4 electron volts . find : 1- kinetic energy in ( joul ) 2- The electron velocity in ( m/s ) 3- The largest wavelength needed to emit electrons from the metal surface
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A photon of wavelength 400 nanometers has fallen on the surface of a metal with a work function of 2.4 electron volts .
find :
1- kinetic energy in ( joul )
2- The electron velocity in ( m/s )
3- The largest wavelength needed to emit electrons from the metal surface
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Solved in 4 steps
- An electron sitting in the -4eV energy level of this atom is struck with a photon and as a result it rises to the -1.8eV energy level. What is the wavelength of this photon? -0.2 ev -0.4 ev -1.8 ev -4 ev 180nm 301nm 797nm 564nmA machine for examining small packages uses X –rays produced from electrons accelerated by a 50 kV potential . The wavelength of the X rays is (a) 2.48 x 10-11 m (b) 2.48 x 10-8 m (c) 1.49 x 10-7 m (d) 1.55 x 10-11 m (e) 2.48 x 10-9 mOrange light with a wavelength of 6.00 x 10^2 nm is directed at a metallic surface with a workfunction of 1.60 eV. Determine the following:a. the maximum kinetic energy of the emitted electrons, in joules. b. the maximum speed of the emitted electrons. c. the potential required to stop these electrons.
- 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?An isolated atom of certain element emits light of wavelength 529 nm when the atom falls from its sixth excited state into its third excited state. The atom emits a photon of wavelength 422 nm when it drops from its seventh excited state into its third excited state. frind wavelength of the light radiated when the atom makes a transition from its seventh to its sixth excited state, in um. a. 21 b. 2.09 c. 2086.34 d 0.0209 e. 208. 63Chapter 38, Problem 039 Through what angle must a 160 kev photon be scattered by a free electron so that the photon loses 12% of its energy? The electron Compton wavelength is 2.43 x 10-12 m. Number Units
- What is the kinetic energy of an electron in a TEM having a 0.0100-nm wavelength?Light with a single wavelength of 490 nm impacts a metal surface releasing an electrons. How much energy in Joules is in each photo of this light? ________ What is the energy in eV of a photon whose wavelength is 490 nm?________ Light with a single wavelength of 490 nm impacts a metal surface releasing an electrons. If the released electrons each have an energy of 1.9 eV, what is the work function of the metal in eV? _____ f the light source were brought closer to the surface so that the light reaching the surface was brighter which would change? ______Determine the wavelength of an electron that has a kinetic energy of 1.15 × 10 J. Report your answer in units of nm.
- The energy levels of an electron in an atomic-like system are given by the expression En = -C/n^p C > 0, p > 0 n = 1,2,3... If the ionization energy for the electron in its ground state is 30 eV, and a photon of wavelength 50 nm is emitted when the electron makes a transition from the third level to the ground state, find C and p.An X-ray photon has a wavelength of 0.01 nm. What is the de Broglie wavelength of an electron that has the same energy as the X-ray photon? O 1.5 X 10-3 nm O 3.0 X 10-3 nm O 3.5 X 10-3 nm O 4.0 X 10-3 nm O 2.0 X 10-3 nm O 2.5 X 10-3 nmBased on your answer in Question 7, when light with a wavelength of 198 nm strikes the surface of tin metal, electrons are ejected with a maximum kinetic energy of 2.9 x 10-19 J. What is the binding energy of these electrons to the metal?