What powers the Sun?
A. chemical burning of hydrogen and oxygen
B. the breakdown of neutrinos
C. nuclear fission of helium into hydrogen
D. nuclear fusion of hydrogen into helium
E. friction as it moves through the gases of space
Answer: D
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Phase Angles: The phase angle in a series RL circuit at 1.0 kHz with a 0.20-k? resistor and a certain inductor is 40°. What is the inductance in this circuit?
A. 84 mH B. 74 mH C. 27 mH D. 37 mH E. 58 mH
Series/Parallel Circuits: For the circuit shown in the figure, the ideal battery has an emf ? = 80 V. The four resistors have resistances of R1 = 14 ?, R2 = 21 ?, R3 = 21 ?, and R4 = 14 ?. Calculate the rate at which heat is being generated in the resistor R4.
Fill in the blank(s) with the appropriate word(s).
Applying E = hf to photon emission from an atom, the symbol E represents the energy
A) of the emitted photon. B) difference between atomic energy levels producing the photon. C) both of these D) neither of these
A lens that is thicker at the center than at the edge is
a. a diverging lens only. b. a convex lens only. c. a converging lens only. d. both a convex lens and a converging lens.