The book shows a photograph of a human face, taken at shorter and shorter camera exposure times. What is observed at the shortest exposure times, and what does this observation demonstrate about the nature of light?
A) We observe a very dim but complete image of the face, showing that light is made of waves that have smaller amplitude as the light is reduced.
B) We observe light and dark lines due to interference, showing that light is a wave.
C) Individual white dots are distributed all over the photographic plate, showing that light is made of waves.
D) We observe individual white dots at the center of the photograph, showing that the camera tends to focus individual photons at this point.
E) Individual white dots were distributed randomly over the photographic plate, showing that light interacts with the screen in tiny bundles.
E
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Heating due to the greenhouse effect is caused by the fact that our atmosphere lets
A. infrared wavelengths in but prevents heat loss at visible wavelengths B. visible light through but prevents heat loss at longer (infrared) wavelengths C. visible light through but prevents heat loss at shorter (ultraviolet) wavelengths
The first planets around other stars were discovered
A) by Huygens, following his realization that other stars are Suns. B) by Galileo following the invention of the telescope. C) about a century ago. D) in the 1990s. E) in the 2010s.
Fusion is used to produce the largest nuclei known to exist
a. True b. False Indicate whether the statement is true or false
The circuit below contains three 100-W light bulbs and a capacitor. The emf ? = 110V. At the instant the switch S is closed, which light bulb is brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.