TA Practice quiz key - CH301 Fall 2010 Practice QuizTA...

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CH301 Fall 2010 Practice Quiz—TA Style Answer Key . Which of the following wavelengths would correspond to lowest energy electromagnetic radiation? 1. 1.56 km 2. 760 nm 3. 41.2 mm 4. 3.34 nm 5. 7.89 km 6. 98.4 m According to the equation E = hc/ λ , the energy of a photon is inversely proportional to its wavelength. The longest wavelength (7.89 km) would have the lowest energy. 2. Emission spectra are an example of the failure of classical mechanics because classical mechanics predicted ________ emission, but in fact ________ emission was experimentally observed. This results from the ________ of electrons’ energy levels. 1. continous, degenerate, proximity 2. degenerate, exponential, quantization 3. continuous, discrete, quantization 4. exponential, linear, degeneracy 5. discrete, continuous, linearity The quantization of electron energy levels in atoms (and molecules) results in discrete line emissions when gases are electrified. 3. What would be the approximate energy, in Joules, of a photon of wavelength 20 nm?
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TA Practice quiz key - CH301 Fall 2010 Practice QuizTA...

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