Give several observations supporting the idea that the high redshifts of quasars really do imply great distances
What will be an ideal response?
(a) We see many quasars with high redshifts, but none with blueshifts. (b) Images show that quasars are embedded in the centers of extremely distant galaxies. (c) Some quasars have been observed to be members of distant galaxy clusters. (d) There are examples of nearby active galaxies (Seyfert galaxies) that look a lot like quasars except that they are less powerful.
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How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 6.09 × 1015 photons/s B) 5.03 × 1012 photons/s C) 3.07 × 1015 photons/s D) 3.07 × 1013 photons/s
A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?
A) 45 mph B) 50 mph C) 52.5 mph D) 55 mph E) 60 mph
At what temperature in Fahrenheit does water boil?
A. 32 degrees F; B. 100 degrees F; C. 212 degrees F; D. 261 degrees F
Which of the following particles has not been observed experimentally?
a. photon b. graviton c. antiproton d. Z0 boson