Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy B. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B.
B) Galaxy B is four times as far as Galaxy A.
C) Galaxy B is twice as far as Galaxy A.
D) Galaxy A is four times as far as Galaxy B.
E) Not enough information to say; you need to know Hubble's constant to answer this question.
C) Galaxy B is twice as far as Galaxy A.
You might also like to view...
What happens when a core's density exceeds that which electron degeneracy pressure can support?
a. The core collapses to a black hole. b. The core collapses to a neutron star. c. The core collapses to a white dwarf. d. The core collapses to a neutron star or a black hole.
Alex throws a 0.43-kg rubber ball down onto the floor. The ball's speed just before impact is 6.5 m/s, and just after is 5.5 m/s. What is the magnitude of the change in the ball's momentum?
a. 0.09 kgm/s c. 4.3 kgm/s b. 1.0 kgm/s d. 5.2 kgm/s
An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are 1.333 and 1.466 . If a ray of light is incident on the air-to-oil surface at an angle of 40.0° with the normal, what is the incident angle at the oil-to-water surface?
a. 24.2° c. 26.0° b. 37.0° d. 18.1°
This image combines a visible-light view of the galaxy Hercules A with an image showing radio wave emission (the reddish colors) in its vicinity. The likely explanation for the two huge clumps of radio emission far to either side of the visible galaxy is
A) the radio emission comes from gas shot out into space by jets powered by a supermassive black hole in the galactic center. B) the radio emission comes from gas that was left behind in the halo when the galaxy collapsed from a protogalactic cloud. C) the radio emission comes from gas pulled out of the galaxy when it collided with another galaxy in the distant past. D) this galaxy must have suffered two collisions in the past, with each collision pulling out gas in one direction.