A(n) _____ is a model universe with Earth at the center, such as the Ptolemaic Universe
A) heliocentric universe
B) eccentric universe
C) geocentric universe
D) concentric universe
C
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There are three ________ of elementary particles in the standard model.
Fill in the blank(s) with the appropriate word(s).
The loop is partway into the field (as shown).
A. Current flows clockwise in the loop. B. Current flows counterclockwise in the loop. C. Current does not flow in the loop.
A candle is 32.0 cm in front of a convex spherical mirror of radius of curvature 68.0 cm. What are the image distance and the magnification, respectively?
a. –16.5 cm, + 0.515 b. –21.8 cm, – 1.94 c. –36.0 cm, + 0.242 d. –1.9 cm, + 1.94 e. 16.5 cm, – 0.515
A hydrogen atom makes a downward transition from the n = 20 state to the n = 5 state. Find the wavelength of the emitted photon
The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s) A) 2.43 ?m B) 1.46 ?m C) 1.94 ?m D) 2.92 ?m