A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm
and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what is the minimum thickness of the film to see a bright reflection?
A)
100 nm
B)
200 nm
C)
300 nm
D)
400 nm
E)
500 nm
A
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A force of 15.2 N directed along the positive x-axis combines with a second force to produce a total force vector of magnitude 17.9 N. What is the magnitude of the second vector?
A. Not enough information is given. B. 9.5 N C. 23.5 N D. 2.7 N
When an LRC series circuit is at resonance, which one of the following statements about that circuit is accurate? (There may be more than one correct choice.)
A) The reactance due to the inductor and capacitor has its maximum value. B) The reactance of the capacitor is zero. C) The current amplitude is a maximum. D) The reactance of the inductor is zero. E) The impedance has its maximum value.
In what part of the H-R diagram are white dwarfs?
A. lower center B. just above the Sun on the main sequence C. upper right D. upper left E. lower right
Shapley's measurements of the distances to open clusters vastly revised our understanding of our position in the Galaxy
Indicate whether the statement is true or false