U-235 and Pu-239 are both
A) radioactive isotopes.
B) fissionable isotopes.
C) heavier than lead.
D) all of the above
E) none of the above
Answer: D
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The energy required to move an electron in a hydrogen atom from energy level 1 to energy level 2 is:
A) 10.2 eV. B) 12.1 eV. C) 12.75 eV. D) 13.1 eV. E) 13.6 eV.
A flat coil is in a uniform magnetic field. The magnetic flux through the coil is greatest when the plane of its area is
A) parallel to the magnetic field. B) at 45° with the magnetic field. C) perpendicular to the magnetic field.
A balloon of negligible mass is filled with 300 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.18 kg/m3.)
a. 150 kg c. 333 kg b. 300 kg d. 444 kg
In nickel-silver copper alloys, the major alloy elements are nickel and _________.
Fill in the blank(s) with the appropriate word(s).