Redshift surveys give us:
A) an idea of how turbulent the intergalactic gas is.
B) a 3-D layout of galaxies in space.
C) the total mass of the universe.
D) a more accurate census of the Local Group.
E) a better value of the speed of light.
B
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Spectroscopic parallax denotes the apparent shift in the position of a star when observed form different positions of a source
Indicate whether the statement is true or false
If we say that a material is opaque to ultraviolet light, we mean that it
A) absorbs ultraviolet light. B) emits ultraviolet light. C) transmits ultraviolet light. D) reflects ultraviolet light.
If we know the average separation and period of revolution for a binary system, we can then measure
A) the actual luminosity of each star. B) the actual mass of both individual stars. C) their absolute magnitudes. D) the actual sizes of the two stars. E) the total mass of the system.
Two loudspeakers placed 6.0 m apart are driven in phase by an audio oscillator whose frequency range is 2193 Hz to 2967 Hz
A point P is located 4.4 m from one loudspeaker and 3.6 m from the other. The speed of sound is 344 m/s. The frequency produced by the oscillator, for which constructive interference of sound occurs at point P, is closest to A) 2580 Hz. B) 2903 Hz. C) 2473 Hz. D) 2795 Hz. E) 2688 Hz.