In Bragg's law, 2d sin ? = m?, how is ? measured?
a. from the reflecting crystal plane
b. from the normal to the reflecting crystal plane
c. from the direction of the incident beam
d. from the normal to the direction of the incident beam
a
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What is a polymorph?
What will be an ideal response?
A stream of a certain liquid compound is not attracted to an electrically charged rod. The compound is probably
a. metallic. b. ionic. c. nonpolar covalent. d. polar covalent.
A battery is attached to several different capacitors connected in parallel. Which of the following statements is true?
1.All capacitors have the same charge, and the equivalent capacitance is greater than the capacitance of any of the capacitors in the group. 2.The capacitor with the largest capacitance carries the smallest charge. 3.The potential difference across each capacitor is the same, and the equivalent capacitance is greater than any of the capacitors in the group. 4.The capacitor with the smallest capacitance carries the largest charge. 5.The potential differences across the capacitors are the same only if the capacitances are the same.
A parallel-plate capacitor is disconnected from a battery, and the plates are pulled a small distance farther apart. Does C increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same