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H03- Atomic Theory 1-solutions

H03- Atomic Theory 1-solutions - neutzler(cln558 H03 Atomic...

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neutzler (cln558) – H03: Atomic Theory 1 – Mccord – (50970) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points What is the correct order of increasing fre- quency? 1. ultraviolet radiation, visible light, in- frared radiation, radio waves 2. radio waves, visible light, ultraviolet radi- ation, infrared radiation 3. radio waves, infrared radiation, visible light, ultraviolet radiation correct 4. radio waves, infrared radiation, ultravio- let radiation, visible light 5. infrared radiation, radio waves, visible light, ultraviolet radiation Explanation: radio waves < infrared radiation < visible light < ultraviolet radiation 002 (part 1 of 2) 10.0 points Light with a frequency of 6 . 86 × 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 437 . 318 nm. Explanation: ν = 6 . 86 × 10 14 Hz c = 3 × 10 8 m / s c = λ ν λ = c ν = 3 × 10 8 m / s 6 . 86 × 10 14 s - 1 = 4 . 37318 × 10 - 7 m · 10 9 nm 1 m = 437 . 318 nm 003 (part 2 of 2) 10.0 points When an electron beam strikes a block of copper, x-rays of frequency 2 . 99 × 10 19 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 10 . 0334 pm. Explanation: ν = 2 . 99 × 10 19 Hz λ = c ν = 3 × 10 8 m / s 2 . 99 × 10 19 s - 1 = 1 . 00334 × 10 - 11 m · 10 12 pm 1 m = 10 . 0334 pm 004 10.0 points What kind of radiation causes molecules to vibrate? 1. visible 2. ultraviolet 3. microwave 4. x-rays 5. infrared correct Explanation: 005 (part 1 of 3) 10.0 points Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 590 nm. How much energy is emitted by an excited sodium atom when it generates a photon? Correct answer: 3 . 36915 × 10 - 19 J. Explanation: λ = 590 nm = 5 . 9 × 10 - 7 m c = ν λ, so E = h ν = h c λ = 6 . 626 × 10 - 34 J · s 5 . 9 × 10 - 7 m × (3 × 10 8 m / s) = 3 . 36915 × 10 - 19 J
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neutzler (cln558) – H03: Atomic Theory 1 – Mccord – (50970) 2 006 (part 2 of 3) 10.0 points How much energy is emitted by 11 mg of sodium atoms emitting light at this wave- length? Correct answer: 97 . 0767 J. Explanation: mass = 11 mg = 0 . 011 g E = 0 . 011 g Na 22 . 99 g / mol Na × (6 . 022 × 10 23 atoms / mol) × (3 . 36915 × 10 - 19 J / atom) = 97 . 0767 J 007 (part 3 of 3) 10.0 points How much energy is emitted by 1 mol of sodium ions emitting light at this wavelength?
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