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# Practice - Information you may(or may not nd useful...

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Information you may (or may not) find useful Constants constant value unit Planck’s constant ( h ) 6 . 626 × 10 - 34 J · s Rydberg constant ( R H ) 2 . 178 × 10 - 18 J speed of light 2.997924 × 10 8 m/s Avogadro’s number 6 . 022 × 10 23 gas constant (R) 8 . 31451 J/K · mol gas constant (R) 0 . 08206 L · atm/K · mol electron charge ( e ) 1 . 6022 × 10 - 19 C electron mass 9 . 1094 × 10 - 31 kg Proton mass 1 . 67252 × 10 - 27 kg Neutron mass 1 . 67495 × 10 - 27 kg Conversions from to conversion Fahrenheit Celsius o C = ( o F - 32 o F ) × 5 o C 9 o F Celsius Fahrenheit o F = 9 o F 5 o C × ( o C ) + 32 o F Celsius Kelvin K = ( o C + 273 . 15 o C ) ( 1 K 1 o C ) atm torr 1 atm = 760 torr atm Pa 1 atm = 101,325 Pa 1

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1 light and matter waves a Calculate the velocity in m/s of a neutron with a wavelength of 1.45 · 10 - 11 m. Answer: 6 points b Calculate the wavelength of the photons in a light packet composed of 3.41 · 10 - 6 mol photons and with a total energy of 738 mJ. Answer: 6 points 2
2 hydrogen atom a A hydrogen atom is excited in the n = 4 state. Suddenly the atom losses energy by emitting a photon. After the emission the hydrogen atom turns out to be in the n = 2 state. What is

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