Using the quantum theory of EM waves, ___________ was successful in explaining the photoelectric effect. (He later won a Nobel Prize for this work.)
A. Hertz
B. Planck
C. Einstein
D. Maxwell
E. Bohr
C. Einstein
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Is it possible for an object to have an acceleration of zero and a numerical value for velocity? Justify your answer with an example
Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of
a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization
You press a stick that has a varying cross-sectional area horizontally between the palms of your hands. The area of the stick pushing against your left palm is twice the area of the stick pushing against your right palm.The pressure on your left palm is one half the pressure on your right palm
a. True b. False Indicate whether the statement is true or false
Most of the mass of the Milky Way seems to exist in the form of
A) population II stars in the Halo. B) dark matter out in the Halo. C) population I stars in the disk. D) hydrogen gas in the disk and spiral arms. E) the black hole in the Galactic Center.