The spectral lines of a star will appear ________ if the star is moving away from the Earth.
A. blue shifted (i.e., shifted toward the shorter wavelengths)
B. the same (no shift)
C. red shifted (i.e., shifted toward the longer wavelengths)
Answer: C
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When ice melts, its temperature
a. increases. b. decreases. c. stays constant. d. cannot be determined.
The energy transformation that occurs during downhill skiing is
A) kin E ? grav E. B) chem E ? kin E + therm E. C) kin E ? grav E + therm E. D) grav E ? chem E. E) grav E ? kin E + therm E.
Suppose you live at latitude 20°S. Based on the given right ascensions and declinations, which of the following stars passes closest to your zenith on its daily path through your sky?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.70 cm and the length of the eye is 3.0 cm. Assume the wavelength of starlight in the eye is 600 nm. (1 nm = 10-9 m)
a. 5.2 × 10^-4 m c. 2.6 × 10^-6 m b. 3.1 × 10^-6 m d. 2.6 × 10^-4 m