Radioactive isotopes are useful for
A) dating the ages of objects.
B) tracing the path of certain chemicals.
C) cancer therapy.
D) All of the above.
E) None of the above.
D
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If you want to design a phototube that ignores all visible light, what should its cathode’s work function be?
A. Below 1.77 eV B. Any value between 1.77 eV and 3.1 eV C. Some specific value between 1.77 eV and 3.1 eV D. Above 3.1 eV E. Some other value or range (specify)
The fundamental frequency of an open tube corresponds to a wavelength equal to one-half of the length of the tube
Indicate whether the statement is true or false
Energy in the Electric Field: A tiny particle carries a charge of 6.0 ?C. What is the energy density in the electric field at a distance of 4.0 m from this charge? (?0 = 8.85 × 10-12 C2/N ? m2, k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.050 mJ/m3 B. 0.20 mJ/m3 C. 0.81 mJ/m3 D. 3.2 mJ/m3
A nylon bar (E 5 2.1 GPa) with diameter 12 mm, length 4.5 m, and weight 5.6 N hangs vertically under its own weight. The elongation of the bar at its free end is approximately:
(A) 0.05 mm
(B) 0.07 mm
(C) 0.11 mm
(D) 0.17 mm