quiz1 - ground n = 1 state(a does it emit or absorb a...

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10/12/2005 SC1: Introduction to Chemistry QUIZ 1 (Take Home) (Due Friday 10/14/05) Each problem is worth 25%. You must show all work clearly to get any credit; no exceptions. Watch your units; carry them through your calculations. Stuyvesant High School Instructor: Andrew M Kolchin 1. A radio station broadcasts a radio signal (wave) at 770 KHz. (a) What is the wavelength of this wave (in meters)? (b) How much energy would a photon of this frequency have? 2. Suppose it takes a minimum of 3 . 2 * 10 - 18 J to dislodge an electron from a metal. What is the minimum frequency a photon must have to dislodge the electron? 3. An electron in a hydrogen atom goes from the excited n = 2 state to the
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Unformatted text preview: ground ( n = 1) state, (a) does it emit or absorb a photon? (b) Let E 1 be the energy of the ground state and E 2 , the energy of the excited state. What is the frequency of the photon involved in this process in terms of E 1 , E 2 , and h (Planck’s Constant)? 4. The DeBroglie Wavelength of a particle (Matter Waves) was said in class to be h/ ( mv ) where h is Planck’s Constant, m is the particle’s mass, and v is the particle’s speed. (a) What is the DeBroglie wavelength (in meters) of an electron moving at a speed of 10 5 m/s ? (b) What is the DeBroglie wavelength (in meters) of a 3000 kg vehicle moving at 80 kilometers/hour?...
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