The ________ theory was based on the assumption that the universe was eternal and unchanging
a. inflationary
b. accelerating
c. steady-state
d. big bang
C
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Vectors V1 and V2 are orthogonal. If V1 is (5i + 7j - 3k) and V2 = (7i + Vy j + 14k), then component Vy in vector V2 is:
(A) 3.6 (B) 1.0 (C) -5.2 (D) 2.7
A hydrogen atom makes a downward transition from the 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
A "burning glass" used to concentrate sunlight in a tiny spot is a
A) converging lens. B) diverging lens. C) either of these D) neither of these
An important use of x-ray diffraction was:
a. the observation of Compton scattering. b. determining the structure of the DNA molecule. c. production of positrons. d. observation of the photoelectric effect.