Which of the following statements about halo stars is false?
A) Halo stars have random orbits about the Milky Way center.
B) Halo stars are no longer being formed at the current epoch.
C) All halo stars are less massive than our Sun.
D) Halo stars are made entirely of hydrogen and helium with no heavy elements.
E) Halo stars are some of the oldest known objects in the universe.
D
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Globular clusters are found in the Milky Way's
Indicate whether the statement is true or false.
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
Spectral Series: What is the longest wavelength in the Balmer series?
A. 240 nm B. 328 nm C. 365 nm D. 656 nm E. 820 nm
The angular size of the Moon in the sky is about
a. 1/2 degree. b. 5 degrees. c. 10 degrees. d. 1.6 kilometers. e. 4000 kilometers (1/4 Earth's diameter).