A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
A) infinite B) -30 cm C) 18 cm D) 38 cm E) -19 cm
D
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A 200-volt battery is connected to a 0.50-microfarad parallel-plate, air-filled capacitor. Now the battery is disconnected, with care taken not to discharge the plates. Some Pyrex glass is then inserted between the plates, completely filling up the space. What is the final potential difference between the plates? (The dielectric constant for Pyrex is ? = 5.6.)
What will be an ideal response?
The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. What is the peak wavelength of this radiation? The constant in Wien's law is 0.0029 m ? K
What will be an ideal response?
To what form or forms of energy does the relationship E = mc2 apply?
A) only kinetic energy and nuclear energy B) nuclear energy only C) kinetic energy only D) thermal energy only E) all forms of energy
A 5000-? resistor and a 50-?F capacitor are connected in series at t = 0 with a 6-V battery. The capacitor is initially uncharged. What is the current in the circuit at t = 0? At t = 0.5 s? What is the maximum charge stored on the capacitor?