Lacey_Che131_F2010_Lect-20p

Lacey_Che131_F2010_Lect-20p - Lec Lec-20 Quantum mechanical...

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Lec-20: Quantum mechanical Model of Hydrogen Lec 20: Quantum mechanical Model of Hydrogen Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 1 Waves Review Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 2
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Wave properties Refraction Here Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Wave properties Diffraction & Interference Constructive interference destructive interference Here Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4
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Waves What is the wavelength of microwaves with a frequency of 2 × 10 10 s 1 ? A) 0.67 m B) 0.015 mm C) 663 nm D) 1.5 cm f c λ = 81 10 1 3. 01 0 0.015 21 0s cm s m f ⎛⎞ × == = ⎜⎟ × ⎝⎠ 100 0.015 1.50 cm mc m m = Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 5 Atomic Spectra Each element emits a unique electromagnetic spectrum h h t d t ffi i tl hi h t t Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 6 when heated to sufficiently high temperatures.
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Atomic Spectra Each element emits a unique electromagnetic spectrum Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 7 when heated to sufficiently high temperatures. Atomic Spectra The atomic absorption spectrum of an elements is also unique! Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 8
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Line Spectrum f c λ= c f λ = 11 1 ⎛⎞ 12 21 22 1.097 10 ( ) nm nn ⎡⎤ ⎜⎟ ⎣⎦ ⎝⎠ Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 9 Line spectrum What is the wavelength of the What is the wavelength of the Line in the visible hydrogen Spectrum corresponding to 1 1.097 10 ( ) nm −− n 1 = 2 and n 2 =3? 1.097 10 ( ) 23 nm () 1.097 10 ( ) 0.1389 1 nm 31 3 1.524 10 (nm) nm 1.524 10 ~ 656 nm × Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 10
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Photoelectric effect Here Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 11 Photoelectric effect ` The photoelectric effect is the release of electrons from a metal as a result of The energy absorbed and emitted by atoms is a metal as a result of electromagnetic radiation. ` The photoelectric effect can emitted by atoms is quantized The photoelectric effect can be explained if electromagnetic radiation consists of tiny particles E hf f c λ = = consists of tiny particles called photons. hc E = Here 0 E hf = Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 12 Work function
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Waves The work function for Hg is 7.22x10 -19 J, (a) what is the minimum frequency of light required to eject photoelectrons from the surface of Hg? (b) Could one use visible light to do this ? Eh v ≡Φ= () 0 19 34 0 7.22 10 6.626 10 JJ s ν −− ×=× g ( ) 19 15 1 0 34 7.22 10 1.09 10 6.626 10 J s Js × == × × g Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 13 Atomic Spectra ` An energy level is an allowed state that an electron can occupy in an atom. ` Movements of Movements of electrons between energy levels are called electron transitions.
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This note was uploaded on 02/21/2012 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lacey_Che131_F2010_Lect-20p - Lec Lec-20 Quantum mechanical...

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