Monochromatic light is incident on a grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?
A)
202 nm
B)
403 nm
C)
452 nm
D)
605 nm
E)
806 nm
B
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When we think of electric potential difference, we are thinking about
A) current. B) voltage. C) resistance.
Due to the vast scale of the universe, when we observe a star in the night sky, we are seeing it
A) not as it is now, but as it will be in the future B) as it was at the moment the universe formed C) as it is right now D) not as it is now, but as it was in the past
The flow of groundwater is dependent on
A) topography of the ground surface. B) gravity only. C) pressure only. D) hydraulic conductivity and pressure.
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 55 km/s/Mpc
How fast would a galaxy located 500 megaparsecs distant be receding from us? Show all work clearly, and state your final answer with a complete sentence. Give the speed in units of kilometers per second and as a percentage of the speed of light.