If the Galactic Year is defined as the orbital period of the solar system, how long does it take us to circle the center? How do we know?
What will be an ideal response?
225 million years, measured by the motion of the Sun relative to the distant halo stars and globular clusters.
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Energy Levels: Light shines through atomic hydrogen gas that was initially in its ground state. You observe that after awhile much of the hydrogen gas has been excited to its n = 5 state. What wavelength of light entering the gas caused this excitation? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 110 nm B. 91.4 nm C. 95.2 nm D. 2280 nm
Pumped storage facilities ________
a. increase the overall efficiency of a power plant b. make use of the output of electricity from photovoltaic cells c. are used to produce electricity mainly at night d. have an increase in their potential energy mainly at night e. cannot be used with a nuclear plant
In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. A gold ion, Au+, has a mass of approximately 3.3 × 10-22 g. How many grams of gold are deposited by this process?
A) 28 g B) 22 g C) 16 g D) 33 g E) 97 g
Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
a. A comparison is impossible unless they are both floating at the same level. b. Fish A displaces a greater quantity of water than fish B. c. Fish B displaces a greater quantity of water than fish A. d. They both displace the same quantity of water. e. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.