A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The resistance of the light bulb in ohms is
a. 0.05 b. 20.
c. 720 d. none of the above.
b
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Of all the forms of electromagnetic radiation, the one with the lowest frequency is:
A) gamma rays. B) ultraviolet rays. C) visible light. D) microwaves. E) radio waves.
In ancient times permanent magnets were known to the Greeks. These magnets were chunks of iron ore now called magnetite. What is the older name for this material?
A. magnesia B. lodestone C. oersted D. compass E. None of these choices are correct.
Which of the following applies to Io?
A) It is the most volcanically active body in the solar system. B) It is thought to have a deep, subsurface ocean of liquid water. C) It is the only moon in our solar system with an atmosphere thicker than Earth's atmosphere. D) It is the largest moon in the solar system. E) It is probably a captured Kuiper belt object.
A star of apparent magnitude ________ appears 2.51 times brighter than a star of apparent magnitude 4.
A. 10 B. 3 C. 1 D. 6.51 E. 1.49