Iridescent colors in the pearly luster of an abalone shell are due to
A) refraction.
B) diffraction.
C) dispersion.
D) polarization.
E) interference.
Answer: E
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Star A has a temperature 3 times that of star B. Both star A and star B are the same physical size. Which statement about star A and star B below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
If the voltage across a circuit element has its maximum value when the current in the circuit is zero, which of the following statements must be true?
1.The circuit element is a resistor. 2.The circuit element is a capacitor. 3.The circuit element is an inductor. 4.The current and voltage are 90° out of phase. 5.The current and voltage are 180° out of phase.
A meniscus lens is made with the radius of curvature of the convex surface being 45.0 cm and the concave surface 25.0 cm. If the glass used has index of refraction 1.50, what is the focal length of this lens?
A) 32 cm B) 113 cm C) 25.0 cm D) -32 cm E) -113 cm
The force of attraction between a - 40.0 ?C and + 108 ?C charge is 4.00 N. What is the separation between these two charges?
A) 2.10 m B) 3.67 m C) 3.12 m D) 2.49 m E) 1.13 m