CHEM 1A Study Guide - Midterm Guide: Electron Rest Mass, Elementary Charge, Gas Constant
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CHEM 1A Full Course Notes
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Information you may (or may not) nd useful. Avogadro"s number gas constant (r) gas constant (r) electron charge (e) electron mass. Pa conversion oc = (of 32of ) 5oc. 5oc (oc) + 32of of = 9of. 1 light and matter waves (20 pts) a an electron is accelerated to 5. 78 102 km/s. Give the wavelength of this electron in nm. 9. 109 10 31 kg 5. 78 105 m/s = 1. 26 10 9 m = 1. 26 nm. Calculate the wavelength (in nm) of a light pulse composed of 4. 52 10 8 mol photons and a total energy of 6. 72 mj. = 8. 05 10 7 m = 805 nm. Answer: 805 nm or 8. 05 102 nm. 8 points c explain brie y why the wavelength of an object like a tennis ball is physically meaningless. ( 4 points) The wavelength of macroscopic objects would be many orders of magnitude smaller than the size an atom, making this quantity physically meaningless.
