Astronomers use ________ to determine the magnetic field of white dwarfs.
A. the Zeeman splitting of spectral lines
B. the doppler effect
C. conservation of angular momentum
D. Wien's law
Answer: A
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A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an object is placed 16 cm from the lens, how far from the object will the image be?
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