The positively charged particle inside an atom is
a. the electron.
b. the proton.
c. the neutron.
d. the nucleus.
e. none of the above.
b
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You can get a sunburn while under the "shade" of a beach umbrella due to
A) reflected sunlight from the sand. B) refracted sunlight from the water. C) light scattering in the air. D) none of the above
The Devonian period is most noted for the
A) ability of certain fishes to breath air. B) ability of certain fishes to move onto land. C) first amphibians. D) great diversification of fishes—some developed lungs, some moved to land, and some became amphibians.
Simple Harmonic Motion: The position of an object that is oscillating on a spring is given by the equation x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?
A. 0.183 rad/s B. 5.46 rad/s C. 2.34 rad/s D. 17.4 rad/s E. 0.869 rad/s
According to present understanding, a nova is caused by
A) hydrogen fusion on the surface of a white dwarf. B) carbon fusion in the core of a white dwarf. C) hydrogen fusion on the surface of a neutron star. D) a white dwarf that gains enough mass to exceed the 1.4-solar-mass limit.