For a mixture of two different elements A and B, at one atmosphere of pressure three phases are in equilibrium (?, ?, and liquid), and it is desired to keep all three phases in equilibrium. Which of the following statements is true?
(a) If the temperature is changed, the composition of the ?, ?, and liquid phases changes.
(b) The composition of the ? phase is changed by adding more A-type atoms.
(c) The composition of the liquid phase is changed by adding more A-type atoms.
(d) Nothing can be changed.
(d) Nothing can be changed.
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Smaller worlds are more prone to atmospheric loss via impacts than large worlds because they
A) have no plate tectonics B) have weaker gravities C) are more likely to be hit D) have less internal heat
To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?
Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?
a. 1.2E–1 years b. 1.9E+1 years c. 4.3E+0 years d. 6.3E+1 years e. 8.1E+0 years
Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)
A) The image of the object will always be smaller than the object. B) The image of the object will always be inverted. C) No matter where you place the object, a real image of the object will be formed. D) No matter where you place the object, the image of the object will always be virtual and upright. E) If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual.