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18. The Ka X ray in a certain element has an energy of 8585 eV. Identify the element by its atomic number. 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd 75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg 107 Bh 108 Hs 109 Mt 110 Ds 111 Rg 112 Cn 19. In a certain one-electron atom, the longest wavelength at which the atom in its ground state can absorb a photon is 7.598 nm. What is the next longest wavelength at which a photon can be absorbed from the ground state of this atom? 20. A small helium-neon laser produces a light beam with an average power of 3.5 mW and a diameter of 2.4 mm. How many photons per second are emitted by the laser? The He-Ne laser wavelength is 632.8 nm.

          18. The Ka X ray in a certain element has an energy of 8585 eV. Identify the
element by its atomic number.
25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn
43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd
75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg
107 Bh 108 Hs 109 Mt 110 Ds 111 Rg 112 Cn
19. In a certain one-electron atom, the longest wavelength at which the atom in
its ground state can absorb a photon is 7.598 nm. What is the next longest
wavelength at which a photon can be absorbed from the ground state of this
atom?
20. A small helium-neon laser produces a light beam with an average power of
3.5 mW and a diameter of 2.4 mm. How many photons per second are
emitted by the laser? The He-Ne laser wavelength is 632.8 nm.

18. The Ka X ray in a certain element has an energy of 8585 eV. Identify the
element by its atomic number.
25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn
43 Tc 44 Ru 45 Rh 46 Pd 47 Ag 48 Cd
75 Re 76 Os 77 Ir 78 Pt 79 Au 80 Hg
107 Bh 108 Hs 109 Mt 110 Ds 111 Rg 112 Cn
19. In a certain one-electron atom, the longest wavelength at which the atom in
its ground state can absorb a photon is 7.598 nm. What is the next longest
wavelength at which a photon can be absorbed from the ground state of this
atom?
20. A small helium-neon laser produces a light beam with an average power of
3.5 mW and a diameter of 2.4 mm. How many photons per second are
emitted by the laser? The He-Ne laser wavelength is 632.8 nm.

Added by Kevin H.

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