Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge.
b. Z has a negative charge.
c. Y has a positive charge.
d. Z has a positive charge.
e. Z is neutral (has no net charge.)
d
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The location of the Galactic Center was first found by Harlow Shapley with:
A) radio emissions from Sagittarius A. B) Cepheids of Population I in the spiral arms. C) RR Lyrae variables in the globular clusters. D) planetary nebulae in the open clusters. E) infrared observations of the heat from its accretion disk around the black hole.
The source of electrons that illuminate a common lamp in your home is
A) the power company. B) the electrical outlet. C) atoms in the lamp filament. D) the wires leading to the lamp. E) the source voltage.
The symbol indicating the number of neutrons in a nucleus is N
a. True b. False Indicate whether the statement is true or false
The light reflected from a soap bubble (n = 1.40) appears red (? = 640 nm) at its center. What is the minimum thickness (in nm)?
a. 124 b. 104 c. 114 d. 134 e. 234