The most accurate way to determine the surface temperature of a star is to study
a. the pattern of absorption lines from various atoms.
b. the relative intensities of light measured through different photometric filters.
c. the peak wavelength of the star's continuous blackbody spectrum.
d. pattern of emission lines that are on the star's spectrum.
a
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Each form element is called a(n) ______.
A. cell B. field C. tag D. label
A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 40 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory?
What will be an ideal response?
What evidence supports the existence of a black hole at the center of our galaxy?
A) The motions of the gas and stars at the center indicate that it contains 4 million solar masses within a region only 3 light-years across. B) We observe a large, dark object that absorbs all light at the center of our galaxy. C) We can see gas falling into an accretion disk and past the event horizon of a black hole. D) We observe an extremely bright X-ray source at the center of our galaxy. E) All of the above
A 2.0 mm diameter wire of length 20 m has a resistance of 0.25 ?. What is the resistivity of the wire?
A) 0.25 ? ? m B) 5.0 × 10-7 ? ? m C) 3.9 × 10-8 ? ? m D) 4.0 × 10-7 ? ? m E) 16 × 10-8 ? ? m