What distance method is used to determine the distance to the most distant galaxies?
a. Radar echo
b. Supernova observations
c. Period-luminosity relationship of variable stars
d. Parallax
B
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A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N / m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
a. 0.37 T b. 1.6 T c. 0.50 T d. 1.2 T e. 2.5 T
The Sun appears to travel daily in the sky
a. one degree in 4 minutes. b. 7 ° in one hour. c. 360° in 12 hours. d. 23.5° in one year.
Fourier discovered that periodic waves can be represented by
A) a series of non-periodic waves. B) the summation of a series of simple sine waves. C) a binary code. D) pulses of the same amplitude.
An atom gains one extra electron. How does the resulting ion behave when it is near a positively charged transparency? How does the ion behave when it is near a negatively charged tissue?
A) The ion is attracted to the positively charged transparency, but repelled from the negatively charged tissue. B) The ion is repelled from both the transparency and from the tissue. C) The ion is repelled from the positively charged transparency, but attracted to the negatively charged tissue. D) The ion is attracted to both the transparency and to the tissue.