An energy of 13.6 eV is needed to remove an electron from the n = 3 state of a lithium atom. If a single photon accomplishes this task, what wavelength is needed? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.6 × 10^?19 J, and 1 nm = 10?9 m)
a. 146.3 nm
b. 30.5 nm
c. 13.8 nm
d. 91.4 nm
e. 234 nm
d
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Banked Curves: Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v. What is the safe speed on the larger-radius curve?
A. v /
B. 2v
C. v
D. v/2
By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. C) All galaxies were born at the same time, and all will die at the same time. D) All galaxies outside the Local Group are orbiting the Local Group. E) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.
Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them. The 15.0-kg block accelerates when the string holding the system in compression is cut and the 30.0-kg box accelerates in the opposite direction. What is the magnitude of the force from the expanding spring on the 30.0-kg box when the 15.0-kg box is undergoing an acceleration of 5.00 m/s2?
a. 37.5 N b. 150 N c. 225 N d. 75.0 N e. 0 N
How are the units for the slope of a graph determined?