Which one of the methods below enables astronomers to measure the distance of a star near the Sun in our galaxy?
a. sound echoes knowing the speed of sound and time
b. parallax using Earth's orbit
c. human binocular vision
d. Balmer series
e. none of the above
b
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What causes precession and why does it "move" the celestial equator among the stars?
What will be an ideal response?
In 1632, which book did the Inquisition order sales to be stopped?
a. De Revolutionibus b. Stederreus Nunctus c. Dialogo d. De Stella Nova e. Astronomia Nova
About where is our solar system located within the Milky Way Galaxy?
a) about half way from the center of the galaxy to the outskirts of the galactic disk b) in the halo of the galaxy about the galactic disk c) near the far outskirts of the galactic disk
What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 4 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 243 nm B) 486 nm C) 556 nm D) 312 nm E) 609 nm