In a halo around the Milky Way's nuclear bulge lie about 200
a. brown dwarfs.
b. quasars.
c. red supergiants.
d. globular clusters.
d
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Resolution: Treat the pupil of your eye as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are 283 m distant from you. How far apart must these two point sources be if they are to be just barely resolved by your eye, assuming that the resolution is limited by diffraction?
Fill in the blank(s) with the appropriate word(s).
Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to match the energy of a gamma-ray photon with energy 4.1 × 10-13 J? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 1.0 × 106 B) 1.4 × 108 C) 6.2 × 109 D) 3.9 × 103
In circular aperture diffraction, how does the diameter of the hole affect the diffraction pattern?
A. The smaller the hole the narrower the central maximum. B. The smaller the hole the wider the central maximum. C. The smaller the hole the smaller the angle to the first dark fringe. D. The hole diameter does not affect the pattern.
In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top of a vertical circle with a radius of 2.5 km?
A) 79 m/s B) 310 m/s C) 260 m/s D) 160 m/s E) 510 m/s