The vast majority of pulsars are known only from their pulses in
A) X-rays.
B) gamma-rays.
C) visible light.
D) microwaves.
E) radio waves.
E
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Which previously unknown planet's location was predicted from mathematical calculations of orbital motions?
A) Mercury B) Uranus C) Neptune D) Pluto E) all of the above
Magnetic Field of a Long Wire: At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A)
A. 1.0 mm B. 1.0 cm C. 2.0 cm D. 3.0 cm E. 4.0 cm
About the Introductory Astronomy category
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Which of the following processes is involved in the sunspot cycle?
A) a large change in the amount of visible light emitted by the Sun B) an imbalance in the operation of the solar thermostat C) a slight gravitational contraction of the Sun D) small variations in the rate of nuclear energy generation in the solar interior E) the winding of magnetic field lines due to the Sun's rotation