The biological damage caused by radioactive materials is due to
A) nuclear fusion occurring within biological cells.
B) thermal energy created by radioactive decay within biological cells.
C) nuclear fission occurring within biological cells.
D) the fast-moving daughter nuclei [or residual nuclei] passing through biological cells.
E) the fast-moving alpha, beta, and gamma particles passing through biological cells.
E
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One method of strengthening the ceramic Si3N4 is by producing a(n) _________microstructure.
Fill in the blank(s) with the appropriate word(s).
Fundamental Forces: Inside the nucleus, the strongest of the four fundamental forces is
A. the weak nuclear force. B. the electromagnetic force. C. the gravitational force. D. the strong nuclear force.
The current produced by voltage in a circuit is impeded by
A) electric barriers. B) closed switches. C) electric resistance. D) none of the above
A long straight wire carries a current. A positive charge moves toward the wire in a direction perpendicular to the wire. The direction of the force on the charge will be
A. parallel to the wire opposite the direction of the current. B. parallel to the wire in the direction of the current. C. There is no force D. opposite the direction of the charge's velocity. E. in the direction of the charge's velocity.