A slit of width 0.01 mm has light of wavelength 600 nm passing through it onto a screen 60 cm away. How wide (in cm) is the central maximum?
A)
0.12 cm
B)
7.2 cm
C)
1.8 cm
D)
3.6 cm
E)
0.9 cm
B
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How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?
A) It should have a higher fraction of elements heavier than hydrogen and helium. B) It should be higher in mass. C) It should be much more luminous. D) It should orbit the galactic center at a much higher rate of speed. E) All of the above differences would be expected.
An 800-MW electric power plant has an efficiency of 30%. It loses its waste heat in large cooling towers. Approximately how much waste heat (in MJ) is discharged to the atmosphere per second?
A. 1 200 B. 1 900 C. 800 D. 560 E. 240
What happens when a planet passes in front of its star (i.e. between the star and us)?
a) The star increases in brightness and the star moves away from us b) The star increases in brightness and the star moves towards us c) The star decreases in brightness and the star moves towards us d) The star does not change in brightness or move relative to us e) The star decreases in brightness and the star moves away fromus
An experimenter surveyed one-half acre of a desert preserve and found three cactus wren nests. Assuming that the habitat is fairly uniform, how many nests would he expect to be in the entire 200-acre preserve?
a. 6 b. 200 c. 600 d. 1200 e. 6000