What happens when an electron in an atom absorbs a photon?
A. The electron moves to the nucleus.
B. The electron moves to a lower energy level.
C. The electron turns into a proton.
D. The electron moves to a higher energy level.
Answer: D
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The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A
Which of the following is closest in size (radius) to a white dwarf?
A) Earth B) a small city C) a football stadium D) a basketball E) the Sun
Water pressurized to 3.5 × 10^5 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?
a. 2.5 × 10^5 Pa, 15 m/s b. 3.0 × 10^5 Pa, 10 m/s c. 3.0 × 10^5 Pa, 15 m/s d. 4.5 × 10^5 Pa, 1.5 m/s e. 5.5 × 10^5 Pa, 1.5 m/s
Lens-Maker Formula: A double-concave lens has equal radii of curvature of magnitudes 15.1 cm. An object placed 14.2 cm from the lens forms a virtual image 5.00 cm from the lens. What is the index of refraction of the lens material?
A. 1.98 B. 2.06 C. 1.90 D. 1.84