The most accurate measurements known are
A) mass measurements. B) measurements of electric charge.
C) spectroscopic measurements. D) made with thermometers.
C
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Astronomers can use ________ to measure magnetic fields on the Sun
a. helioseismology b. perchloroethylene (C2Cl4) c. neutrino detectors d. a magnetic carpet e. the Zeeman effect
Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?
A) 0.10 ?T B) 0.40 ?T C) 0.50 ?T D) 0.60 ?T E) 0.80 ?T
The habitable zone around a star refers to the places where living organisms are found
Indicate whether the statement is true or false
A resistor is made of a material that has a resistivity that is proportional to the current going through it. If the voltage across the resistor is doubled, what happens to the current through it?
a. It doubles. b. It quadruples. c. It increases by a factor of 23/2. d. It increases by a factor of 21/2.