Which of the following is most likely to occur when an observer finds a star moving perpendicular to his or her line of sight?
A) Neither a blueshift nor a redshift occurs.
B) Only a blueshift occurs.
C) Only a redshift occurs.
D) Both a blueshift and a redshift occur.
A
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Suppose you are standing due east of a car traveling southwest. What is the direction of the car’s angular momentum around you? Choose from the possible directions below (as seen by a person hovering over you), where A is north, C is east, and so on. If you are using the letters on the book’s back cover, you can indicate a double letter by pointing to the letter with two fingers. 
A. A B. B C. C D. D E. Upward F. Downward T. (The vector is zero)
An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter. What is the rms value of the electric field in this laser beam?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 2200 N/C B) 1000 N/C C) 1100 N/C D) 4100 N/C E) 2000 N/C
Astronomers refer to the dark center of a sunspot as a(n) ____
a. spicule b. flare c. penumbra d. umbra e. eye
What is the maximum angular magnification of a magnifying glass of focal length 10 cm? (Assume the near point is at 25 cm.)
What will be an ideal response?