Which of the following best describes the microstructure resulting from a eutectic reaction?
(a) Alternating grains of ? and ?-phases.
(b) Grains of the ?-phase with precipitate particles of the ?-phase.
(c) A volume with only ?-phase grains and another volume with only ?-phase grains.
(d) The grains contain alternating plates or rods of the ? and ? phases.
(d) The grains contain alternating plates or rods of the ? and ? phases.
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The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. Which labeled transition represents an electron that absorbs a photon with 10.2 eV of energy?
A) A B) B C) C D) D E) E
If the phase angle between sound waves from two different point sources is 180°, what kind of interference will occur?
A) destructive B) constructive C) either constructive or destructive
Two slits separated by 0.10 mm are illuminated with green light (? = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away
a. 2.3 b. 2.5 c. 2.7 d. 2.1 e. 2.0
Polarization: Unpolarized light of intensity I0 passes through four ideal polarizing sheets. The polarizing angle of each sheet is rotated 30° from the one before it, so that the last sheet is aligned at 90° to the first sheet. What is the intensity of the light emerging from the fourth sheet in terms of I0?
Fill in the blank(s) with the appropriate word(s).