Which of the following statements is incorrect?
a. Capacitance is always positive.
b. The symbol for potential difference between the plates of a capacitor is .
c. Water is a polar molecule.
d. When a dielectric is placed in a capacitor it serves to reduce the electric field.
e. Nonpolar molecules cannot be used for dielectric material in a capacitor.
e
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Which relationship concerning the mass of protostars is FALSE?
A) The more massive ones will reach the main sequence first. B) The more massive ones will be the hottest and most luminous. C) The more massive ones one will be made of the heaviest elements. D) The more massive ones are so luminous they ionize the gas, hence red H II regions. E) The more massive ones create a lot of ultraviolet as well as visible light.
A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV
If a 1.0-V stopping potential is required to make the electron current zero, what is the wavelength of light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 355 nm B) 423 nm C) 497 nm D) 744 nm
A car travels around an oval racetrack at constant speed. The car is accelerating
a.
at all points except B and D.
b.
at all points except A and C.
c.
at all points except A, B, C, and D.
d.
everywhere, including points A, B, C, and D.
e.
nowhere, because it is traveling at constant speed.
In a radioactive decay,
u are converted into kinetic energy. How much kinetic energy is this? 
A. 
B. 
C. 
D. 
E. 