H03- Atomic Theory 1-solutions

H03- Atomic Theory 1-solutions - phan(dtp377 H03 Atomic...

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phan (dtp377) – 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 – fnd all choices beFore answering. 001 10.0 points What is the correct order oF decreasing Fre- quency? 1. visible light, ultraviolet radiation, in- Frared radiation, radio waves 2. radio waves, visible light, ultraviolet radi- ation, inFrared radiation 3. ultraviolet radiation, visible light, in- Frared radiation, radio waves correct 4. inFrared radiation, radio waves, visible light, ultraviolet radiation 5. radio waves, inFrared radiation, visible light, ultraviolet radiation Explanation: ultraviolet radiation > visible light > inFrared radiation > radio waves 002 (part 1 of 2) 10.0 points Light with a Frequency oF 7 . 34 × 10 14 Hz lies in the violet region oF the visible spectrum. What is the wavelength oF this Frequency oF light? Correct answer: 408 . 719 nm. Explanation: ν = 7 . 34 × 10 14 Hz c = 3 × 10 8 m / s c = λ ν λ = c ν = 3 × 10 8 m / s 7 . 34 × 10 14 s - 1 = 4 . 08719 × 10 - 7 m · 10 9 nm 1 m = 408 . 719 nm 003 (part 2 of 2) 10.0 points When an electron beam strikes a block oF copper, x-rays oF Frequency 1 . 91 × 10 19 Hz are emitted. What is the wavelength oF these x-rays? Correct answer: 15 . 7068 pm. Explanation: ν = 1 . 91 × 10 19 Hz λ = c ν = 3 × 10 8 m / s 1 . 91 × 10 19 s - 1 = 1 . 57068 × 10 - 11 m · 10 12 pm 1 m = 15 . 7068 pm 004 10.0 points What kind oF radiation causes molecules to vibrate? 1. ultraviolet 2. x-rays 3. microwave 4. visible 5. inFrared correct Explanation: 005 (part 1 of 3) 10.0 points Sodium vapor lamps, used For public lighting, emit yellow light oF wavelength 580 nm. How much energy is emitted by an excited sodium atom when it generates a photon? Correct answer: 3 . 42724 × 10 - 19 J. Explanation: λ = 580 nm = 5 . 8 × 10 - 7 m c = ν λ, so E = h ν = h c λ = 6 . 626 × 10 - 34 J · s 5 . 8 × 10 - 7 m × (3 × 10 8 m / s) = 3 . 42724 × 10 - 19 J
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phan (dtp377) – H03: Atomic Theory 1 – mccord – (51600) 2 006 (part 2 of 3) 10.0 points How much energy is emitted by 20 . 4 mg of sodium atoms emitting light at this wave- length? Correct answer: 183 . 137 J. Explanation: mass = 20 . 4 mg = 0 . 0204 g E = 0 . 0204 g Na 22 . 99 g / mol Na × (6 . 022 × 10 23 atoms / mol) × (3 . 42724 × 10 - 19 J / atom) = 183 . 137 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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H03- Atomic Theory 1-solutions - phan(dtp377 H03 Atomic...

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