In ultrasound the __________ of the sound is much greater than in normal sound
Fill in the blank(s) with correct word
frequency
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This person developed his own model in which the Sun and Moon orbited Earth and the planets circled the Sun
a. Galileo b. Newton c. Kepler d. Tycho
Light travels from outside a building to inside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. No phase change occurs at either the inside surface or the outside surface of the glass. b. A 180o phase change occurs at both the inside surface and the outside surface. c. A 180o phase change occurs at the inside surface but not at the outside surface. d. A 180o phase change occurs at the outside surface but not at the inside surface.
The critical angle for a substance in air is measured at 53.7°. If light enters this substance from air at 45.0° with the normal, at what angle with the normal will it continue to travel?
A) 34.7° B) 53.7° C) 45.0° D) It will not continue, but will be totally reflected.
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thick-ness t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in the aluminum to that in the copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5