Of the following, which is the best evidence for the wave nature of matter? (a) (b) (c) (d) (e) the photoelectric effect diffraction of neutrons by crystals x-ray diffraction by crystals the relationship between momentum and energy for an electron the compton effect () if a hydrogen atom is its 3rd excited state. then its ionization energy is (a) -0.54 ev (b) -0.86 ev (c) -1.51 ev (d) 0.54 ev (e) 0.86 ev (0 1.51 ev (g) none of the above.

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?