An electron is trapped in an infinite square well (a box) of width 6.88 nm
Find the wavelength of photons emitted when the electron drops from the n = 5 state to the n = 1 state in this system. (c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg)
A) 6.49 ?m
B) 5.45 ?m
C) 5.91 ?m
D) 7.07 ?m
A
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A) Case 1 B) Case 2 C) Case 3 D) Case 4
A planar loop consisting of four turns of wire, each of which encloses 200 cm2, is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 10 mT to 25 mT in a time of 5.0 ms. What is the resulting induced current in the coil if the resistance of the coil is 5.0 ??
A. 60 mA B. 12 mA C. 0.24 mA D. 48 mA E. 6.0 mA
Refer to the diagram of Racetrack X. 
Refer to the diagram of Racetrack X. It is ________ for a racer to have uniform acceleration ________ on this track.
A. possible; everywhere B. guaranteed; at some places C. impossible; anywhere D. impossible; at some places
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)