Lenses that are thicker at the center than at the edge:
a. converge light.
b. diverge light.
c. redirect light by 90°.
d. refract white light into the color spectrum.
e. neither converge nor diverge light.
a
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The Doppler effect states that the motion of any object can
a. shift the wavelength of spectral lines. b. change the speed of light emitted from the object. c. enhance the chemical composition of the object. d. make the object appear hotter. e. make the object appear cooler.
What evidence do we have that Earth has a molten core?
What will be an ideal response?
The nuclear probability of interacting with neutrons depends most strongly on the neutron's
a. mass b. area c. volume d. speed e. charge
A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature and standard pressure is about 0.10 ?m. A tank containing nitrogen at standard temperature and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?
A. 0.089 ?m B. 0.125 ?m C. 0.080 ?m D. 0.112 ?m