Which of these is a refinement that Niels Bohr made to the Rutherford model of the atom?
A. Electrons orbit about a dense positively charged nucleus.
B. Atoms consist of negatively charged electrons and positively charged protons.
C. An electron's angular momentum is quantized, but not in integral multiples of ?.
D. Electrons can exist only in certain circular orbits about the nucleus.
D. Electrons can exist only in certain circular orbits about the nucleus.
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An object that has zero resistance is a
a. semiconductor. b. superconductor. c. diode. d. transistor. e. positive ion.
Sophia accelerates in her car from 0 to 72km/hour in 8.0 seconds. What’s her acceleration?
a. a = 2.5 m/s2
b. a = 3.5 m/s2
c. a = 4.5 m/s2
d. a = 6.5 m/s2
A student travels from St. Louis to Indianapolis, a distance of 210 mi, in 6.0 h. The return trip over the same route takes 7.0 h. What is the average speed for
a. the first half of the trip? b. the second half of the trip? c. the total trip?
In Fizeau's experiment to measure the speed of light, the wheel has 475 notches and rotates with a speed of 40.0 rev/sec. Light passing through one notch travels to the mirror and back just in time to pass through the next notch
If the distance between the wheel and the mirror is 7890 m, what is the speed of light measured by this experiment? A) 3.00 × 108 m/s B) 3.00 × 10-8 m/s C) 3.22 × 108 m/s D) 3.22 × 10-8 m/s E) 2.25 × 108 m/s