The number of neutrons in a triton is ______________
Fill in the blank(s) with correct word
2
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The terrestrial planets in our solar system are
A) Mercury, Venus, Earth, and Mars. B) Jupiter, Saturn, Uranus, and Neptune. C) Pluto and Eris. D) Mars, Jupiter, Saturn, Uranus, and Neptune.
What is the ecliptic?
A. the extension of Earth's path on the celestial sphere B. the line of the solar and lunar eclipses on the celestial sphere C. the elliptical shape of Earth's orbit around the Sun D. All of these choices are correct.
Spherical Mirrors: The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?
A. -10 cm B. 40 cm C. -40 cm D. -20 cm E. 20 cm
Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?
A) Reflecting telescopes have their heaviest component (the mirror) at the bottom rather than the top of the telescope's tube. B) Reflecting telescopes take up less space than refracting telescopes. C) Reflecting telescopes are taller than refracting telescopes. D) For a mirror and lens of the same diameter, a mirror will collect more light.