Of the thousands of different isotopes known to exist,
a. most of them are radioactive.
b. only a couple can be used to build an atom bomb.
c. some are used in medical diagnosis and treatment.
d. most occur naturally.
e. all of the above
a, b, c
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The process of an edge dislocation combining with a vacancy to circumvent an obstacle is dislocation _________.
Fill in the blank(s) with the appropriate word(s).
A charge of 1.0 × 10-6 ?C is located inside a sphere, 1.25 cm from its center. What is the electric flux through the sphere due to this charge? (?0 = 8.85 × 10-12 C2/N • m2)
A) 0.11 N • m2/C B) 8.9 N • m2/C C) 0.028? N • m2/C D) It cannot be determined without knowing the radius of the sphere.
When an object floats in a liquid, the buoyant force is ____________ the weight of the object
a. equal to b. larger than c. smaller than d. not related to
When did the quaternary period occur?
What will be an ideal response?