In an analysis relating Bohr's theory to the de Broglie wavelength of electrons, when an electron moves from the n = 1 level to the n = 3 level, the circumference for its orbit becomes 9 times greater. This occurs because:
a. the wavelength of the electron becomes nine times as long.
b. there are triple as many wavelengths, and each wavelength is triple in length.
c. there are nine times as many wavelengths in the new orbit.
d. the electron is moving nine times as fast.
B
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Exclusion Principle: The principal quantum number n can have any integer value ranging from
A. -? to +?. B. 0 to ?. C. 1 to ?. D. 1 to 100.
One way astronomers deduce that the Milky Way has a disk is that they
A. see the same number of stars in all directions in the sky. B. see far more stars along the band of the Milky Way than in other directions. C. see a large dark circle silhouetted against the Milky Way in the Southern Hemisphere. D. see stars arranged in a circular region around the north celestial pole. E. None of these choices is correct.
The current through a 50-? resistor is I = (0.80
A) sin(240t), where t is measured in seconds. What is the rms current? A) 0.57 A B) 0.80 A C) 1.1 A D) 1.6 A
A flat rectangular coil with dimensions of 8.0 cm × 10 cm is dropped from a zero magnetic field position into a 1.4-T magnetic field in 0.10 s
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