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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X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density
a. True b. False Indicate whether the statement is true or false
With what color light would you expect to be able to see the greatest detail when using a microscope?
A) blue, because it is brighter B) red, because of its long wavelength C) blue, because of its shorter wavelength D) red, because it is refracted less than other colors by glass E) The color makes no difference in the resolving power, since this is determined only by the diameter of the lenses.
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?
The colors of objects we see by reflected light are due to
a. interference c. specular reflection b. selective absorption d. diffuse reflection