Three originally uncharged infinite parallel planes are arranged as shown. Then the upper plate has surface charge density ? placed on it while the lower plate receives surface charge density ??. The net charge induced on the center plate is
a.
0.
b.
??/2.
c.
+?/2.
d.
??.
e.
+?.
a
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An atom can be excited into a higher energy state by absorbing a __________
Fill in the blank(s) with correct word
Consider a flat plate or a plane wall with a thickness L and long cylinder of radius r0. Both of these are made of materials such that they can be treated as lumped capacitances (Bi<0.1). Show that in each case, the characteristic length ? c, defined as ? c=(V/As), can be approximated as (L/2) and (r0/2) respectively.
GIVEN • Plane wall with a thickness L • Long cylinder of radius r0 • Both cylinder and plane wall can be treated as lumped capacitances (Bi<0.1) SHOW • Characteristic length can be approximated as (L/2) and (r0/2) respectively. ASSUMPTIONS • Both plane wall and cylinder can be treated as lumped capacitances
Assume the size of the Sun is represented by a baseball with the Earth is about 15 meters (150 million km or 8 light minutes) away. How far away, to scale, would the nearest stars to the Sun be? Choose the closest answer
a. about the distance between New York and Boston (330 km) b. 100 meters away c. about the distance across the United States from New York to Los Angeles (4300 km) d. about the distance across 50 football fields (50 × 100 m)
An excited atom decays to its ground state and emits a photon of green light. If instead the decay is to an intermediate state, then the light emitted could be
A) red. B) violet. C) blue. D) any of the above E) none of the above