The accretion disk of a black hole is typically very hot. What kind of telescope would we use to observe it at its strongest wavelength?
A. a space-based radio telescope
B. a ground-based gamma-ray telescope
C. a ground-based X-ray telescope
D. a space-based X-ray telescope
E. None of these choices are correct.
Answer: D
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A bicycle pump contains air at one atmosphere and 0°C. As the tire is pumped up, the volume of air decreases by 50% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change?
A. 2 B. 1 C. 0.5 D. 0.1 E. 3
A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper
Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium? A) the aluminum B) the copper C) Neither one; both of them experience the same size gain or loss of heat. D) It is impossible to tell without knowing the masses. E) It is impossible to tell without knowing the volumes.
Which of the following refer to the basic categories associated with the energy of a single molecule in a gaseous phase?
a. nuclear, electronic, interval b. electronic, translation, rotation, vibration c. ionic, covalent, hydrogen, Van der Waals d. translation, rotation, vibration e. dipole-dipole, covalent, ionic, translation
A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens
Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107, h = 1.055 × 10-34 J ? s) (a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm?