The color on the outer edge of the primary rainbow is
A) white
B) red
C) violet
D) yellow
E) green
B
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The rare earth element gadolinium is ferromagnetic, and it has a saturation magnetization of 20×105 A/m at low temperatures.
(a) Calculate the number of Bohr magnetons per atom of gadolinium atom, knowing that the atomic mass is 157.2 g/mole and the density is 7.89 g/cm3. (b) What is the average number of parallel unpaired electron spins in the 4f shell per gadolinium atom?
Estimate the maximum heat flux obtainable with nucleate pool boiling on a clean surface for (a) water at 100 kPa on brass, (b) water at 1 MPa on brass.
GIVEN
? Nucleate pool boiling on a clean surface
FIND
? The maximum heat flux obtainable for
(a) water at 1 atm on brass; and
(b) water at 10 atm on brass
ASSUMPTIONS
? Water is at saturation temperature
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water from Table 9.2 for surface tension
A double-convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?
A) 70 cm B) 63 cm C) 75 cm D) 66 cm E) 58 cm
The expression(s) indicating the number of protons in a nucleus is
a. A b. N c. Z d. Z + N e. A – Z