Radioactive Dating

1) If you find a rock that has equal parts uranium-235 and lead-207, what is its age? 2) If you find a rock that has three times as much lead-207 as uranium-235, how old is it? 3) If you find a rock that has seven times as much lead-207 as uranium-235, how old is it? 4) If you find a rock that has fifteen times as much lead-207 as uranium-235, how old is it? 6666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666 The Land Where the Blues Began (Alan Lomax) In the film, Alan Lomax argues that most modern American popular music comes from the blues--from rap to jazz to rock 'n' roll and R&B. But the film also shows other forms of musical or rhythmic expression, from a recitation of "the signifying monkey" to fife-and-drum bands. (Talk about the kind of music you listen to yourself, or even music that your kids listen to (if you have kids). And answer the following questions- Is Lomax right? Can you find elements of the blues in your favorite music? Or do you think it comes from a different tradition entirely?) The Land Where the Blues Began (Alan Lomax) YouTube URL: http://www.youtube.com/watch?v=XIj1wyK1cPI