The merger of a transparent plastic foil substrate with a semiconductor CdS film for a
photonic application was realized using pulsed-laser deposition. Although plastic is not
considered to be a favoured substrate material for semiconductor thin-film formation, the
deposited CdS film possesses good adhesion, with a polycrystalline texture, flat surface
(roughness/thickness = 0.003), and room-temperature photosensitivity with a blue-shifted peak at 2.54 eV. This work
demonstrates the capability of pulsed-laser deposition to form novel heterostructures with
appealing and useful technological properties such as plasticity and low weight.
Students take a weekly quiz in our introductory physics course. During the week in which material focused on projectile motion, we not-so-subtly suggested what problem the students would see on the quiz. The quiz problem was an almost exact replica of a homework problem1 we worked through in the class preceding the quiz. The goal of the problem is to find the launch speed if the final horizontal and vertical positions and launch angle are given. Figure 1 shows a schematic of the trajectory.
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