If a person's eyeball is too long from front to back, the person is likely to suffer from
A)
spherical aberration.
B)
chromatic aberration.
C)
nearsightedness.
D)
farsightedness.
E)
astigmatism.
C
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Carbon has a negative temperature coefficient of resistance of –0.5 × 10^–3 (°C)?1 . What temperature increase would result in a resistance decrease of 1.0% for a carbon resistor?
a. 2.0°C b. 20°C c. 20°C d. 50°C e. 100°C
The y-component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. (c = 3.0 × 108 m/s) (a) What is the largest that the x-component of the wave can be? (b) What is the largest that the z-component of the wave can be?
A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker, what total work is done on the wheelbarrow?
a. 240 J c. 144 J b. 216 J d. 96 J
Which of the following electron orbital transitions is not allowed?
(a) 3p to 3s (b) 4d to 3p (c) 5d to 4s (d) 5p to 4d