What are two advantages of CCDs over photographic films for astronomy?
What will be an ideal response?
CCDs are much more light efficient, can capture much fainter objects in a given exposure, and yield digital images that are instantly displayed without having to be developed.
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An electronic game requires 6 V for operation. With a transformer it can be powered by a 120-V outlet. If the primary has 500 turns, the secondary has
A) 4 turns. B) 25 turns. C) 50 turns. D) more than 50 turns. E) none of the above
A hypothetical particle has a mass of 510 MeV/c2. If such a particle at rest decays into two gamma-ray photons, what is the wavelength of each photon? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J? s)
What will be an ideal response?
Which of the following is an example of a reversible process?
A) An ice cube at 0°C melts while in a water bath at 0°C. B) A hand pump is rapidly compressed and the pressure and temperature in the pump rise. The pump is held in position as the temperature drops to the ambient temperature. C) A stick of dynamite explodes. D) A high pressure air tank at room temperature has its valve opened and the gas in the tank rushes out until the pressure in the tank is equal to atmospheric pressure. E) A car engine burns fuel to produce motion of the car and exhausts the 140°C waste products of the combustion into the 20°C atmosphere.
Why do scientists suspect that life first arose near deep-sea volcanic vents or similar environments with abundant chemical energy?
A) A deep ocean environment would have protected early organisms from ultraviolet radiation before the formation of the ozone layer. B) All organisms have similar DNA, with further relations having greater differences. C) The chemical pathways for extracting energy from chemicals in vents are simpler than photosynthesis. D) A and B E) A and C F) A, B, and C