One of the absorption lines of hydrogen has a rest wavelength of 656 nm (at rest means with respect to the observer, like in a lab). You observe several stars and measure the wavelength of this same hydrogen absorption line in each star
Based on the measured wavelength of this line, which star is moving towards the Earth the fastest?
A) 670 nm B) 640 nm C) 656 nm D) 630 nm E) 680 nm
D
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The cosmological redshift is actually not a velocity at all, but a measure of the expansion of space-time
Indicate whether the statement is true or false
If a person is farsighted the corrective lens will
a. take an object at the near point and form an image at 25 cm. b. take an object at 25 cm and form an image at the near point. c. take an object at infinity and form an image at 25 cm. d. take an object at infinity and form an image at the near point.
One side of a normal outlet is at 120 V AC, the other side is at
A) -120 V AC. B) 0 V. C) 240 V. D) 120 V AC. E) +120 V AC.
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 300 m. What is the velocity of the race car at the end of the run?
a. 83 m/s b. 69 m/s c. 52 m/s d. 35 m/s e. 59 m/s