What is the effect of grounding an (uninsulated) electrically charged conducting object?
a. The charge increases as the object gains charge from the earth, or ground.
b. The charge dissipates into the ground.
c. The ground controls the intensity.
d. The object no longer acts as a conductor.
e. The charge decreases but does not disappear, because the ground can only take some of it.
b
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Which statement about the motion of the planets is INCORRECT?
A) Most orbit above the Sun's equator. B) All revolutions of major planets are counterclockwise. C) The orbits of most planets are almost circular, with low eccentricities. D) Most planets move in the Earth's equatorial plane. E) Most planets rotate in the counterclockwise direction when viewed from the North.
A corner cube is formed by three plane mirrors perpendicular to one another resulting in a retroreflector. What is the angle between the directions of an incoming ray of light and of the corresponding outgoing ray of light for this device?
a. 90° c. 0° b. 180° d. 360°
The sources of X-rays are
A) electron clouds. B) the atomic nucleus. C) both of these D) neither of these
Energy Levels: The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 1.54 eV B. 1.65 eV C. 1.79 eV D. 1.81 eV