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Fall 07 HW7 solution - Homework Assignment#7 Name...

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Homework Assignment #7 Name____________________________ Laboratory Section (circle one) MW1.30 MW6.30 TTh7 1. Chapter 7, Problem 2, 4, 10, 11, 12, 13, 20, 24, 28, 30, 40, 44, 48, 52, 56, 59, 60, 64 7.2 a) Figure 7.3 describes the electromagnetic spectrum by wavelength and frequency. Wavelength increases from left (10 –2 nm) to right (10 12 nm). The trend in increasing wavelength is: x-ray < ultraviolet < visible < infrared < microwave < radio waves . b) Frequency is inversely proportional to wavelength according to equation 7.1, so frequency has the opposite trend: radio < microwave < infrared < visible < ultraviolet < x-ray . c) Energy is directly proportional to frequency according to equation 7.2. Therefore, the trend in increasing energy matches the trend in increasing frequency: radio < microwave < infrared < visible < ultraviolet < x-ray . High- energy electromagnetic radiation disrupts cell function. It makes sense that you want to limit exposure to ultraviolet and x-ray radiation. 7.4 Evidence for the wave model is seen in the phenomena of diffraction and refraction. Evidence for the particle model includes the photoelectric effect and blackbody radiation. 7.10 E = hc/ λ = ( )( ) 34 8 12 6.626 x 10 J • s 3.00 x 10 m/s 0.01 Å 1.3 Å 10 m - - = 1.529 x 10 –15 = 1.5 x 10 –15 J 7.11 Since energy is directly proportional to frequency ( E = h ν ) and frequency and wavelength are inversely related ( ν = c/ λ ), it follows that energy is inversely related to wavelength. As wavelength decreases,
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