The Milky Way has no sharply defined outer edge.
Answer the following statement true (T) or false (F)
True
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What are some of the things astronomers can learn about astronomical objects from their spectra?
A. chemical composition B. how fast the objects are moving C. whether a gas or solid or combination, due to the type of spectrum D. All of these choices are correct.
Doppler Effect: A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound. The observer hears a frequency of
A. 1000 Hz B. 2000 Hz. C. 500 Hz. D. 1500 Hz. E. None of these.
Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. Which statement is correct about the distances run and the displacements from the origin?
a. Joan has run a greater distance and her displacement is greater than Mike's. b. Mike has run a greater distance and his displacement is greater than Joan's. c. Joan has run a greater distance, but her displacement is less than Mike's. d. Mike has run a greater distance, but his displacement is less than Joan's. e. Mike has run a shorter distance, and his displacement is less than Joan's.
Polarized light passes through a polarizer. If the electric vector of the polarized light is horizontal what, in terms of the initial intensity I0,
is the intensity of the light that passes through a polarizer if the polarizer is tilted 22.5° from the horizontal? A) 0.191I0 B) 0.854I0 C) 0.147I0 D) 0.011I0