Velocity Selector: In a certain velocity selector consisting of perpendicular electric and magnetic fields, the charged particles move toward the east, and the magnetic field is directed to the north. What direction should the electric field point?
A. toward the east
B. toward the west
C. toward the south
D. upward
E. downward
Answer: E
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A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 350 nm B) 330 nm C) 300 nm D) 380 nm E) 410 nm
An ionized atom having Z protons has had all but one of its electrons removed. If E is the total energy of the ground state electron in atomic hydrogen, then what is the total energy of the remaining electron in the ionized atom?
A) ZE B) E/Z C) E D) Z2E E) E/Z2
Consider a light bulb, in empty space, radiating 200. watts with its filament heated to 2800.°C. Assuming it is a good approximation to a black body
(a) What is the area of the filament? (b) If placed in an oven, with walls at 800.°C, what is its net power radiated now?
The tensile force divided by the original cross-sectional area of a specimen is the engineering normal _____________.
Fill in the blank(s) with the appropriate word(s).