Thin Films: Light is incident perpendicularly from air onto a liquid film that is on a glass plate. The liquid film is 199 nm thick, and the liquid has index of refraction 1.60. The glass has index of refraction 1.50. Calculate the longest visible wavelength (as measured in air) of the light for which there will be totally destructive interference between the rays reflected from the top and bottom surfaces of the film. Assume that the visible spectrum lies between 400 nm and 700 nm.
Fill in the blank(s) with the appropriate word(s).
637 nm
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Thermodynamic Devices: An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C. What is the coefficient of performance of this heat pump?
A. 10.4 B. 9.44 C. 0.644 D. 0.533 E. 0.0962
Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop makes an angle of 60° with the magnetic field?
A. 2.6 × 10-3 T ? m2 B. 1.3 × 10-3 T ? m2 C. 0 T ? m2 D. 2.2 × 10-3 T ? m2 E. 0.80 T ? m2
Which of the following choices is an appropriate unit for measuring entropy changes?
a. J/K b. N/K c. J/s d. J/K
When gravitational, magnetic and any forces other than static electric forces are not present, electric field lines in the space surrounding a charge distribution show
a. the directions of the forces that exist in space at all times. b. only the directions in which static charges would accelerate when at points on those lines c. only the directions in which moving charges would accelerate when at points on those lines. d. tangents to the directions in which either static or moving charges would accelerate when passing through points on those lines. e. the paths static or moving charges would take.