A metallic surface has a work function of 2.50 eV. What is the longest wavelength that will eject electrons from the surface of this metal?
What will be an ideal response?
497. nm
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Based on atomic size, which would you expect to be more soluble in water: helium, He, or nitrogen, Image?
A) Although He is smaller, its outer orbital is filled and the atom will have little attraction to the water molecules. B) Since He atoms are smaller, more of them can fit into solution, so it has a higher solubility in water. C) Nitrogen atoms are bigger and so nitrogen molecules should be more soluble in water due to greater dipole-induced dipole attractions. D) He atoms are bigger and so helium molecules should be more soluble in water due to greater dipole-induced dipole attractions.
Approximately what is the half-life of uranium-235?
a. 0.5 billion years b. 1.25 billion years c. 700 million years d. 2.8 billion years
Motor oil, with a viscosity of 0.250 N • s/m2, is flowing through a tube that has a radius of 5.00 mm and is 25.0 cm long. The drop in pressure is 300 kPa. What is the volume of oil flowing through the tube per second?
A) 0.000376 m3/s B) 0.0253 m3/s C) 0.00118 m3/s D) 4.71 m3/s E) 7.54 m3/s
On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to one another.
A. antiparallel B. parallel C. perpendicular D. alternately parallel and antiparallel E. randomly relative