The spectra of stars in other galaxies show a Doppler shift of spectral lines toward the ________ (color) end of the spectrum, thus providing evidence for the expansion of the universe.
Fill in the blank(s) with the appropriate word(s).
red
You might also like to view...
Conversion of Units: Your car gets 34.7 mi/gal on a vacation trip in the U.S. If you were figuring your mileage in Europe, how many km/L did it get? (3.79 L = 1.00 gal; 1.00 mi = 1.61 km)
A. 14.7 km/L B. 9.16 km/L C. 55.9 km/L D. 32.4 km/L
Thermal Expansion: A glass flask has a volume of 500 mL at a temperature of 20°C. The flask contains 492 mL of mercury at an equilibrium temperature of 20°C. The temperature is raised until the mercury reaches the 500 mL reference mark. At what temperature does this occur? The coefficients of volume expansion of mercury and glass are 18 × 10-5 K-1 (mercury) and 2.0 × 10-5 K-1 (glass).
A. 120°C B. 110°C C. 100°C D. 140°C E. 130°C
By comparing the two images, what can you conclude about Io's volcanoes?
A) Every black spot in the visible image has a bright spot in the infrared image, so all of Io's volcanoes were active when the photos were taken. B) There are more black spots in the visible image than bright spots in the infrared image, so many of Io's volcanoes were inactive when the photos were taken. C) There are more bright spots in the infrared image than black spots in the visible image, so new eruptions must have started after the visible photo was taken.
Which of the following statements about matter—antimatter engines is not true?
A) Matter—antimatter engines would be great in theory, but to date we have no evidence that antimatter even exists. B) Matter—antimatter reactions represent the most efficient possible reactions in terms of energy release. C) Spacecraft powered by matter—antimatter engines could probably reach speeds of more than half the speed of light. D) One of the major challenges to developing matter—antimatter engines is finding a way to store antimatter after it is produced.