test 2 - 1.

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1.   If you reverse the direction of an electric current in a wire the magnetic field around the wire will A) be oriented as it was before B) become oriented with an opposite north direction C) flip to become aligned parallel to the length of the wire. D) cease to exist 2.   Which one of the following waves cannot travel through a vacuum? A) sound waves B) radio waves C) light waves D) x-rays 3.   Which one of the following wave quantities is not related to the others? A) speed B) frequency C) amplitude D) wavelength 4.   An automobile sounding its horn is moving toward an observer. The frequency of the horn's sound relative to its  normal frequency is A) higher B) lower. C) the same
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D) higher or lower depending upon the amplitude of the waves. 5.   The protons in a nucleus stay together due to the A) electrostatic force of attraction B) nuclear force C) gravitational force D) binding force 6.   The radioactive isotope Z has a half-life of 12 hours. After 2 days, the fraction of the original amount remaining  is A) ½ B) ¼ C) 1/8. D) 1/16 7.   When an isotope releases gamma radiation the atomic number A) decreases by two and the mass number decreases by four
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test 2 - 1.

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