When a dielectric material is introduced between the plates of a parallel plate capacitor the capacitance increases by a factor of 4. What is the dielectric constant of the material introduced between the plates?
A) 0.4
B) 1/4
C) 2
D) 4
E) None of the other choices is correct.
D
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Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions
Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just before the snowballs reach the ground below? (There could be more than one correct choice.) A) Debra's snowball will stay in the air longer than Mary's snowball. B) Mary's snowball will stay in the air longer than Debra's snowball. C) Both snowballs will take the same amount of time to hit the ground. D) Debra's snowball has exactly the same acceleration as Mary's snowball. E) Mary's snowball has a greater downward acceleration than Debra's snowball.
State the Rayleigh criterion
What will be an ideal response?
Active galaxy radio lobes and jets contain magnetic fields
a. True b. False Indicate whether the statement is true or false
Quantum mechanics has accurately described the regularities of the periodic table by assigning "quantum" numbers to predict the allowed energy levels. The true statement about quantum numbers is that
A. no two electrons in the same atom can have the same set of quantum numbers. B. there are never more than 8 different sets of quantum numbers in an atom. C. they describe the position and charge of the electrons in the atoms. D. no electrons in the world can ever have the same set of quantum numbers.