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Chemistry for Engineers Assignment
Typology: Assignments
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Abigail E. Sasuman BS Civil Engineering, 1st Year CHM012-B Assignment 1
Assignment 2 Portions of electromagnetic waves A, B, and C are represented by the following (not drawn to scale): Rank them in order of (a) increasing frequency; (b) increasing energy; (c) increasing amplitude. (d) If wave B just barely fails to cause a current when shining on a metal, is wave A or C more likely to do so? (e) If wave B represents visible radiation, is wave A or C more likely to be IR radiation? Answers: (a)increasing frequency C, B, A (b)increasing energy C, B, A (c) increasing amplitude C, B, A (d)If wave B just barely fails to cause a current when shining on a metal, is wave A or C more likely to do so? No. According to the observations in photoelectric effect, the ability of light to eject an electron depends on its frequency, not on the intensity. Since wave C has longer wavelength than waves A and B, this means it has the lowest energy out of all the waves, since longer wavelength means lower frequency, and lower frequency means lower energy. If wave B barely fails (succeeded but come really close to failing) to cause a current, this means its frequency hits the threshold frequency (frequency needed to eject an electron), even if it comes close to failing, as long as it succeeded in causing a current when shined on a metal at the end. With wave C having the lowest frequency, it is expected for the wave to completely fail, and with wave A having the highest frequency, it is expected to successfully cause a current when shined on a metal.