The figure shows a color image of Betelgeuse, a red giant star. Which of the surface temperatures below best matches Betelgeuse's surface temperature? Hint: Our Sun at 6000 K is yellow
E
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A warm dust cloud in which stars are forming would be best observed with a(n) ________ telescope.
A. gamma-ray B. infrared C. optical (visible light) D. radio
The two major physical theories of the 20th century are
A) superconductivity and the theory of light. B) electromagnetic theory and quantum theory. C) quantum theory and the theory of relativity. D) the theory of relativity and electromagnetic theory. E) electromagnetic theory and the theory of gravity.
If a spherical concave mirror has a radius of curvature R, its focal length is
A) R/4. B) R/2. C) R. D) 2R. E) 4R.
The part of an electron microscope that plays the same role as the lenses do in an optical microscope is
A) the vacuum chamber. B) the coils. C) the cathode. D) the anode. E) the deflector plates.