Spectral Series: To which of the following values of n does the shortest wavelength in the Balmer series correspond?
A. 3
B. 5
C. 7
D. 1
E. ? (very large)
Answer: E
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If Hubble's constant is taken to be 70 km/s/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?
a. 4100 Mpc b. 0.014 Mpc c. 67 Mpc d. 74 Mpc e. 300,000 Mpc
The practice of science: In what ways does the modern practice of science establish positive feedback (see table 3.2 ) to encourage further discoveries?
Can you identify elements of the historical accounts of Copernicus, Tycho, Kepler, and Galileo that provide an example of positive feedback?
Wavelengths of light are most efficiently measured in:
a. meters. b. inches. c. millimeters. d. centimeters. e. nanometers.
Energy and Momentum: A block of mass m = 9.0 kg and speed V and is behind a block of mass M = 27 kg and speed of 0.50 m/s, as shown int the figure. The surface is frictionless, and the blocks suddenly collide and couple. After the collision, the blocks have a common speed of 0.90 m/s. How much kinetic energy of the blocks is lost due to the collision?
A. 8.6 J B. 2.0 J C. 4.6 J D. 11 J E. 31 J