In ultrasonic nondestructive testing with the pulse echo technique, a crack is detected by the _________ultrasonic waves.
Fill in the blank(s) with the appropriate word(s).
reflected
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When discussing stellar lives, astronomers divide stars by mass into low-mass stars (masses similar to the Sun or lower) and high-mass stars (masses more than about 8 times that of our Sun). Which category includes stars that die in supernova explosions?
A) high-mass stars only B) low-mass stars only C) They both die in supernova explosions. D) Neither: Supernovas only occur in binary star systems.
An object is 50 cm from a concave mirror of radius of curvature of magnitude 60 cm. How far is the image from the mirror?
A) 19 cm B) 35 cm C) 60 cm D) 75 cm E) 120 cm
An insoluble solid that is formed when two liquids (usually aqueous solutions) are mixed is called
a) an acid. b) a precipitate. c) a redox. d) an enzyme.
This model characterizes the diode as a simple switch that is either closed or open.