The three cubes represent three stages in a computer simulation of the formation of protogalactic clouds; they represent a region about 500 million light-years across. Which of the following statements about this model is true?
A) Although the gas looks uniform in the first frame, the model assumes there were small regions with slightly higher densities than other regions.
B) The gas in the third frame looks disorganized, but the model indicates that all this gas soon became the spiral arms of a large spiral galaxy.
C) Although the gas in the three frames looks fairly stationary, the model assumes that the entire blob of gas must have been rotating rapidly.
D) Although the model shows only visible gas, it assumes that there were supermassive black holes randomly distributed throughout the universe.
A) Although the gas looks uniform in the first frame, the model assumes there were small regions with slightly higher densities than other regions.
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What is the wavelength of the shortest wavelength light visible to the human eye?
a. 400 nm b. 4000 nm c. 7000 nm d. 700 nm e. 3×10^8 m
As we become older, the frequency range of human hearing
A) decreases. B) increases. C) remains relatively constant.
A violin with string length 32 cm and string density resonates in its fundamental with the first overtone of a 2.0-m organ pipe with one end closed and one end open. What is the tension in the string if the speed of sound in air is 344 m/s?
A) 110 N B) 4100 N C) 56 N D) 1000 N E) 450 N
Wilhelm Roentgen discovered
a. X-rays. b. gamma rays. c. radio waves. d. microwaves.