How many significant figures are there in the number 46.20?
a) 4
b) 3
c) 2
d) 5
a
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Which publication was Kepler's masterpiece, providing strong evidence to planetary motion and a heliocentric Universe?
a. Alfonsine Tables b. De Revolutionibus c. Rudolphine Tables d. The Prutenic Tables e. Sidereus Nuncius
Photon Momentum: If the wavelength of a light beam is doubled, what happens to the momentum of the photons in that light beam?
A. It is halved. B. It stays the same. C. It is doubled. D. It is reduced by one-fourth of its original value. E. It is increased to four times its original value.
An electron is trapped in a quantum well that is 48.6 nm wide
Calculate the minimum uncertainty in its velocity. (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg) A) 2.38 × 103 m/s B) 1.01 × 103 m/s C) 3.34 × 104 m/s D) 1.79 × 104 m/s E) 7.49 × 103 m/s
How did Brahe measure highly accurate planetary positions?
A) By careful measurements of the brightness of the planets, as seen from Earth. B) With larger and more elegant sighting instruments. C) By his invention of the technique know as triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point). D) With the recently-invented telescope. E) With a new type of telescope that used mirrors instead of lenses.