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H04- EM Radiation-solutions

H04- EM Radiation-solutions - moczulski(ksm935 H04 EM...

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moczulski (ksm935) – H04: EM Radiation – mccord – (50960) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points What is the frequency of light with a wave- length of 4.0 × 10 - 7 m? 1. 3 . 0 × 10 - 14 s - 1 2. 7 . 5 × 10 14 s - 1 correct 3. 3 . 0 × 10 14 s - 1 4. 120 s - 1 5. 1 . 3 × 10 - 15 s - 1 Explanation: 002 10.0points What is the correct order of decreasing fre- quency? 1. radio waves, infrared radiation, visible light, ultraviolet radiation 2. ultraviolet radiation, visible light, in- frared radiation, radio waves correct 3. infrared radiation, radio waves, visible light, ultraviolet radiation 4. radio waves, visible light, ultraviolet radi- ation, infrared radiation 5. visible light, ultraviolet radiation, in- frared radiation, radio waves Explanation: ultraviolet radiation > visible light > infrared radiation > radio waves 003(part1of2)10.0points Light with a frequency of 6 . 84 × 10 14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Correct answer: 438 . 596 nm. Explanation: ν = 6 . 84 × 10 14 Hz c = 3 × 10 8 m / s c = λ ν λ = c ν = 3 × 10 8 m / s 6 . 84 × 10 14 s - 1 = 4 . 38596 × 10 - 7 m · 10 9 nm 1 m = 438 . 596 nm 004(part2of2)10.0points When an electron beam strikes a block of copper, x-rays of frequency 1 . 39 × 10 19 Hz are emitted. What is the wavelength of these x-rays?
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