Astro1 UCSB Final Questions And Answers Rated A+ New Update Assured Satisfaction

A THEORY is a pattern in nature thought to have predictive power. The test of a theory is a prediction. That's where pseudo-science fails. T/F - Answer-T Red giant stars are powered by hydrogen burning in a shell surrounding a core, which has been depleted of hydrogen. T/F - Answer-T Jovian planets have densities similar to that of water, and we know in fact that they are mostly made of water. T/F - Answer-F - Jovian planets are gaseous The Sun appears to circle the Celestial Sphere in one year because the Earth is circling the Sun. The Sun's apparent path is called the horizon. T/F - Answer-F - it's called the ecliptic A planet can occasionally act as a circumpolar star as seen from Santa Barbara. T/F - Answer-F Opaque bodies approximately obey the blackbody laws: the Stefan-Boltzmann Law and Wien's Law. T/F - Answer-T Venus's surface is very hot because it absorbs more sunlight than the earth does. T/F - Answer-B - its thick atmosphere keeps heat from escaping Ozone depletion may have stabilized because of an international agreement to reduce emission of certain industrial chemicals called chlorofluorocarbons. T/F - Answer-T Under exotic conditions, intuition sometimes fails, e.g. speed of light is the same for all observers. T/F - Answer-T Planetary orbits are circles with the Sun in the center. T/F - Answer-F The Cosmic Microwave Background has a blackbody spectrum. T/F - Answer-T Old streambeds and other topographic features indicate that Mars once had liquid water on its surface. T/F - Answer-TA good example of a positive feedback effect in global warming is that melting sea ice causes a decrease in the Earth's albedo, meaning we absorb more sunlight than ever. T/F - Answer-T While the heavy elements have been cooked-up in stars, several of the light elements and isotopes were made in the first few minutes of the Big Bang. T/F - Answer-T How is the transparency of Earth's atmosphere changing in infrared light? - Answer-its decreasing A pulsar is - Answer-a rapidly rotating neutron star, emitting beams of radio and sometimes x-ray and visible energy. How does the ultraviolet transparency of Earth's atmosphere today compare with its natural, preindustrial value? - Answer-its greater The Moon's orbital period and its rotation period are the same. Therefore, - Answer-people on Earth always see the same half of the Moon. How do red giants of 0.2 solar masses differ from those of 1.0 solar mass? - Answer-There aren't any of them, so the question is moot. Suppose the Universe is 14 billion years old. If we observe a galaxy 10 billion light years away, how old was the Universe at the time the light we see left that galaxy? - Answer-4 billion years old The fact that virtually all galaxies are receding from us implies that - Answer-the Universe is expanding The final stage in the evolution of a low-mass star is a - Answer-white dwarf Captain Picard wishes to send a message to a Ferengi ship, which is located behind a large dust cloud. In order to ensure the best possible transmission he sends - Answer-radio waves Suppose Hubble's constant is 100 km/sec/Mpc (this is not the currently accepted value). What would the approximate age of the universe be in this case? You may assume a constant expansion rate. - Answer-COME BACKThe gravitational acceleration on the Earth's surface is ~10 m/s2 . What would it be on the surface of a planet with the same size, but one-half the mass? - Answer-COME BACK Why does hydrogen "burning" by fusion reactions only occur in the deep interiors of the Sun (and other stars)? - Answer-Because the requisite conditions of high temperature and high density only occur there. On its way to Earth, the light from a distant quasar passes through a thin, cool cloud of intergalactic gas. What effect does that cloud have on the quasar spectrum we detect from Earth? - Answer-It adds some absorption lines A1l the terrestrial planets show plate tectonics. - Answer-False