astro 106

astro 106 - Sean O'Keefe Astronomy February 18, 2008...

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Sean O’Keefe Astronomy February 18, 2008 Homework 4 1. Describe the effect of the tidal force on Earth. Is there a tidal force acting on the Moon and how can we tell? On Jupiter’s moon Io? The tidal force on Earth comes from the gravitational pull from the Moon. As a result the moons orbit is growing larger by about 4cm a year. Io causes volcanism on Jupiter, because of its gravitational pull. 2. Stars A and B are identical, but A is 1 light-year away and B 6.32 light-years away from Earth. a. As we move away from a light source how does its intensity change with distance? b. Which of the two stars appears brighter for an observer on Earth? c. What is the ratio of intensities of the stars as seen from Earth? (Hint: write the equation from part a. for each star and compare them) d. What is the difference in apparent magnitude for A and B? a. As in gravitation (where the force drops off as the inverse square of the distance between the masses), intensity drops off as the inverse square of the
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astro 106 - Sean O'Keefe Astronomy February 18, 2008...

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