Lens-Maker Formula: The curved surface of a 50-cm focal length plano-convex lens has a radius of curvature of 30 cm. What is the refractive index of the glass?
A. 1.6
B. 1.5
C. 1.4
D. 1.3
Answer: A
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A straight wire is carrying a current upward. Observed from above (i.e., looking downward towards the wire), the magnetic field lines are
A. radially outward. B. radially inward. C. forming clockwise circles. D. forming counter-clockwise circles. E. directed toward the observer.
A laser beam (? = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits?
A. 3.47 × 10?3 B. 3.47 × 10?2 C. 3.47 × 10?4 D. 3.47 × 10?6 E. 3.47 × 10?5
The Earth's geological history is divided into how many eons?
A) 4 B) 1 C) 3 D) 2
What travels up and down the Sun's magnetic loops extending from the surface?
A) helium atoms B) plasma C) hyrogen atoms D) a blend of helium and hydrogen atoms