Suppose you are looking at the sky at about midnight on the December solstice. Based on the given right ascensions and declinations, which of the following stars will be nearest to your meridian? Assume you live at a latitude where all the stars on this list rise above your horizon each day. (Hint: Recall that the Sun's celestial coordinates on the December solstice are RA = 18h, dec = -23-1/2°.)
A) Spica: RA = 13hr 25m, dec = -11°09'
B) Deneb: RA = 20hr 41m, dec = +45°16'
C) Sirius: RA = 6hr 45m, dec = -16°42'
D) Alpha Centauri: RA = 14hr 40m, dec = -60°50'
E) Vega: RA = 18hr 37m, dec = +38°47'
C) Sirius: RA = 6hr 45m, dec = -16°42'
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When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following things will also increase?
A) the number of electrons ejected per second B) the maximum kinetic energy of the ejected electrons C) the time lag between the onset of the absorption of light and the ejection of electrons D) the work function of the metal E) all of the above
The difference between the pressures inside and outside a tire is called __________
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A sphere made of a radioactive isotope initially has a mass of 6.88 kg. The half-life of this isotope is 1.34 h, and it decays by ?- emission. At the end of 2.68 h, what is the mass of this sphere?
A) 1.72 kg B) 2.53 kg C) 3.44 kg D) 6.88 kg