In attempting to describe the atom, Bohr made a set of general assumptions. Which of the following statements is NOT a result or closely aligned with those general assumptions (the assumptions might not be quantum mechanically correct)?
C.
The velocity of the electron is not constant according to Bohr, but instead changes with changing principal quantum number.
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A knight on horseback holds a 10-m lance. The horse can run at 0.78c. (It wins most of its races!) How long will the lance appear to a person that is standing still on the ground as the horse runs past?
a. 7.1 m c. 10 m b. 15 m d. 6.3 m
A wave is represented by the equation y(x, t) = 3.2 cm sin(1000 rad/s t - 50
x). Another wave is represented by the equation y(x, t) = 4.2cm sin(1000 rad/s t - 50
x). If the two waves interfere constructively, then what is equation that represents the coherent superposition of the two waves?
A. y(x, t) = 7.4 cm sin(1000 rad/s t + 50.0
x)
B. y(x, t) = 1.0 cm sin(1000 rad/s t - 50.0x)
C. y(x, t) = 1.0 cm sin(1000 rad/s t + 50.0x)
D. y(x, t) = 7.4 cm sin(1000 rad/s t - 50.0x)
The angular measurement in hours, minutes, and seconds from the celestial prime meridian eastward is called _______________
a. sundial b. protractor c. declination d. right ascension
Which of the following is NOT true about dark matter?
A.) Evidence for dark matter has been building for many decades. B.) Dark matter and dark energy are two aspects of the same phenomenon. C.) Dark matter is inferred from unseen gravitational effects in galaxies. D.) Dark matter is the dominant source of gravity in the Universe. E.) All of the above are true.