Which of these stars lies closest to the north celestial pole on the celestial sphere?
Consider the following data for four stars:
Star RA Dec.
Spica 13hr24m.1 -11°20'
Deneb 20hr39m.7 +45°06'
Sirius 6hr44m.2 -16°42'
Alpha Centauri 14hr38m.4 -60°46'
A) Deneb
B) Alpha Centauri
C) Spica
D) Sirius
A) Deneb
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A steel tube with diameters d2 5 86 mm and d1 5 52 mm is twisted by torques at the ends. The diameter of a solid steel shaft that resists the same torque at the same maximum shear stress is approxi-mately:
(A) 56 mm
(B) 62 mm
(C) 75 mm
(D) 82 mm
The Balmer Beta absorption line is a result of a transition of an electron in a hydrogen atom from:
A) level 2 to level 3. B) level 2 to level 4. C) level 3 to level 2. D) level 4 to level 2. E) None of the above.
Which of these radio waves would fall in the "water hole"?
A) 19 cm wavelength B) 243 cm in wavelength C) 15,000 cm in wavelength D) 150 cm in wavelength E) 6.563 × 10-5 cm in wavelength
The experiment, which gave the first evidence for the existence of the atomic nucleus, involved which of the following?
a. x-ray scattering b. radioactive dating c. cosmic ray detection d. alpha scattering