If sunlight broke up water molecules in Venus's atmosphere, would the hydrogen atoms es-cape into outer space? Note that Venus's temperature is 740 K. Recall that gas eventually will escape if the average velocity of its atoms is greater than 1/6 times the escape velocity of the planet. The escape velocity of Venus is 10 km/s.
a. No, the average velocity of hydrogen atoms would be 0.8 km/s.
b. No, the average velocity of hydrogen atoms would be 3.9 km/s.
c. Yes, the average velocity of hydrogen atoms would be 3.9 km/s.
d. Yes, the average velocity of hydrogen atoms would be 25 km/s.
e. No, the average velocity of hydrogen atoms would be 25 km/s.
c. Yes, the average velocity of hydrogen atoms would be 3.9 km/s.
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________ are remnants of low-mass stars.
A. White dwarfs B. Pulsars C. Black holes D. Neutron stars
How are the orbits of extrasolar planets different from the orbits of planets in our solar system?
A) Many extrasolar planets orbit their stars backward. B) Many extrasolar planets are on very tilted orbits compared to what we'd expect. C) Many extrasolar planets do not travel on elliptical orbits. D) Many extrasolar planets travel on very eccentric orbits.
A negative magnification for a mirror means
A) the image is inverted, and the mirror is concave. B) the image is inverted, and the mirror is convex. C) the image is inverted, and the mirror may be concave or convex. D) the image is upright, and the mirror may be concave or convex. E) the image is upright, and the mirror is convex.
Refracting Telescope: A simple refracting telescope provides large magnification by employing
A. a short focal length objective and a short focal length eyepiece. B. a short focal length objective and a long focal length eyepiece. C. a long focal length objective and a short focal length eyepiece. D. a long focal length objective and a long focal length eyepiece.