Technology is mainly
A) a body of scientific knowledge.
B) a tool of science.
C) what is wrong with the world.
D) a solution to all of mankind's problems.
Answer: B
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The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77 kg laboratory technician absorbs 2.3 mJ of 0.5 MeV gamma rays in a work day. The relative biological efficiency (RBE) for gamma rays is 1.00
The number of gamma-ray photons absorbed by the technician in a workday is closest to: A) 3 × 1010 B) 3 × 109 C) 3 × 108 D) 1 × 109 E) 1 × 108
Which of the following describes how a metal atoms behaves in a bulk metallic object?
A) The metal ion shares its outermost electrons freely with its neighbors. B) The metal atoms have limited interaction with neighboring atoms. C) The metal atom shares its electrons in a very directional manner. D) The metal atom shares its electrons with only one other atom. E) none of the above
Coulomb's Law: Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to the electrical force that each charge exerts on the other one?
A. It increases by a factor of 2.
B. It increases by a factor of 
.
C. It is reduced by a factor of 
.
D. It increases by a factor of 4.
E. It remains the same.
A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
A. ?100 B. ?25 C. ?50 D. ?15 E. ?10