The beta radiation first classified by Rutherford was in fact which of the following?
a. helium nuclei
b. high energy quanta
c. electrons
d. positrons
c
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Which of the following is NOT a possible explanation for dark energy?
A: quintessence, a fifth substance to the universe that varies in time. B: cosmological constant. C: gravity leaking out to dimensions besides the three spatial dimensions. D: the speed of light changing dramatically with time. E: all of the above.
The potential difference between the plates of a parallel plate capacitor with the plate separation of 6 cm is 60 V. What is the electric field between the plates of this capacitor?
A) 60 V/m B) 500 V/m C) 1000 V/m D) 2000 V/m E) 3600 V/m
To explain the retrograde motion of planets, Ptolemy introduced the concept of ________.
Fill in the blank(s) with the appropriate word(s).
A photon that is emitted during a transition in hydrogen from the n = 27 state to the n = 2 state is in which of the following series?
A. Lyman B. Balmer C. Paschen D. Brackett E. All of these choices are correct.