Elementary particles that experience the weak nuclear force but not the strong nuclear force are called
A) hadrons. B) baryons. C) leptons. D) mesons. E) bosons.
C
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Significant Figures: What is 56 + 
written with the correct number of significant figures?
A. 62.8 B. 62.812 C. 62.81 D. 63 E. 62.8123846
As air temperature cools below its dew point temperature, the air's water vapor
A) increases. B) decreases. C) condenses. D) evaporates.
That quasars were at cosmological distances yet appeared like ordinary faint stars meant
A) they were the brightest stars ever observed. B) they must be very large. C) they must contain many O and B type stars. D) they must be producing such large quantities of energy than even fusion could not explain their output. E) they must be very small, but bright due to gravitational lensing.
__________ are emitted when high speed electrons decelerate as they are smashed into a metal target
Fill in the blank(s) with correct word