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H03- Atomic Theory 1-solutions

H03- Atomic Theory 1-solutions - patel(ap28872 H03 Atomic...

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patel (ap28872) – H03: Atomic Theory 1 – mccord – (51600) 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 10.0points What is the correct order of increasing fre- quency? 1. radio waves, visible light, ultraviolet radi- ation, infrared radiation 2. radio waves, infrared radiation, ultravio- let radiation, visible light 3. radio waves, infrared radiation, visible light, ultraviolet radiation correct 4. ultraviolet radiation, visible light, in- frared radiation, radio waves 5. infrared radiation, radio waves, visible light, ultraviolet radiation Explanation: radio waves < infrared radiation < visible light < ultraviolet radiation 002(part1of2)10.0points Light with a frequency of 7 . 22 × 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 415 . 512 nm. Explanation: ν = 7 . 22 × 10 14 Hz c = 3 × 10 8 m / s c = λ ν λ = c ν = 3 × 10 8 m / s 7 . 22 × 10 14 s - 1 = 4 . 15512 × 10 - 7 m · 10 9 nm 1 m = 415 . 512 nm 003(part2of2)10.0points When an electron beam strikes a block of copper, x-rays of frequency 3 . 2 × 10 18 Hz are emitted. What is the wavelength of these x-rays? Correct answer: 93 . 75 pm. Explanation: ν = 3 . 2 × 10 18 Hz λ = c ν = 3 × 10 8 m / s 3 . 2 × 10 18 s - 1 = 9 . 375 × 10 - 11 m · 10 12 pm 1 m = 93 . 75 pm 004 10.0points What kind of radiation causes molecules to vibrate? 1. microwave 2. x-rays 3. infrared correct 4. ultraviolet 5. visible Explanation: 005(part1of3)10.0points Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 560 nm. How much energy is emitted by an excited sodium atom when it generates a photon? Correct answer: 3 . 54964 × 10 - 19 J. Explanation: λ = 560 nm = 5 . 6 × 10 - 7 m c = ν λ, so E = h ν = h c λ = 6 . 626 × 10 - 34 J · s 5 . 6 × 10 - 7 m × (3 × 10 8 m / s) = 3 . 54964 × 10 - 19 J
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patel (ap28872) – H03: Atomic Theory 1 – mccord – (51600) 2 006(part2of3)10.0points How much energy is emitted by 54 . 7 mg of sodium atoms emitting light at this wave- length? Correct answer: 508 . 597 J. Explanation: mass = 54 . 7 mg = 0 . 0547 g E = 0 . 0547 g Na 22 . 99 g / mol Na × (6 . 022 × 10 23 atoms / mol) × (3 . 54964 × 10 - 19 J / atom) = 508 . 597 J 007(part3of3)10.0points How much energy is emitted by 1 mol of sodium ions emitting light at this wavelength?
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