Leptons are the fundamental particles that are the building blocks of hadrons
a. True
b. False
Indicate whether the statement is true or false
False
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On the H-R diagram, cool and bright stars are located in the ________ corner
a. upper left b. upper right c. lower left d. lower right
Two long parallel wires are placed side-by-side on a horizontal table and carry current in the same direction. The current in one wire is 20 A, and the current in the other wire is 5 A
If the magnetic force on the 20-A wire has magnitude F, what is the magnitude of the magnetic force on the 5-A wire? No external magnetic fields are present. A) 4F B) 2F C) F D) F/2 E) F/4
Einstein won the Nobel Prize for explaining
a. general relativity. b. special relativity. c. the photoelectric effect. d. quantum mechanics.
Quantum mechanics tells us that the probability of finding the electron in hydrogen at a distance between r and r + ?r in the ground state is greatest at a distance _____ a0 , where a0 is the Bohr radius.
A. 0.707 B. 1.00 C. 1.41 D. 2.00 E. 3.001/2