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Constants
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1) The distance to a given star is determined to be
pc (parsec), what is its distance to this star to the nearest light year?
2) In the preceding question what is the parallax angle in degrees to 7 decimal places ?
3) The light spectrum from a distant star peaks at a wavelength of
nm, to the nearest kelvin what is its surface temperature?
4) If we take the luminosity of the Sun in arbitrary units to be unity at the earth's distance from the Sun (1 AU), what is its luminosity (to 3 decimal places) at a distance of
AU?
5) What is the Schwarzchild radius to the nearest tenth of a kilometer of a black hole of mass equal to
solar masses?
6) You are on a spaceship in outer space accelerating at
m/s
2
with respect to the distant stars, if your mass is 87 kilograms what is your weight to the nearest Newton?
7) If the fourth line of the Balmer series (the violet line-410 nm) from a distant galaxy is measured on earth to be
nm what is the recessional speed (v/c) of the galaxy to 2 decimal places?
8) Using the mid value of the Hubble constant, 22.5 km/s/Mly, what is the distance to the nearest tenth of a Mly to the galaxy in the previous problem?
9) If the Hubble constant is exactly
km/s/Mly ,to the nearest tenth of a billion years, what is the estimated age of the universe.