If a wave from one slit of a Young's double slit experiment arrives at a point on the screen one-half wavelength behind the wave from the other slit, which is observed at that point?
A)
bright fringe
B)
dark fringe
C)
gray fringe
D)
multi-colored fringe
B
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Which of the following metals is most likely to recrystallize during hot-working?
(a) Aluminum (b) ?-Iron (c) Cartridge brass (d) Zirconium
For the outside wall shown in Figure 2-50, determine the R-Value, the heat transfer through the wall per unit area and the temperature distribution through the wall if the outside surface temperature is 36ºC and the inside surface temperature is 15ºC.
If a planet has 3 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.80 m/s2)
a. 29.4 m/s2 b. 88.2 m/s2 c. 265 m/s2 d. 3.27 m/s2
John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?
A) 10 cm B) 20 cm C) 30 cm D) 40 cm E) 50 cm