In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Q: Gravitational redshift was measured by Pound, Rebka, and Snider in Harvard's Jefferson Tower using this technique to detect a frequency shift of order one part in ten to the 14th. It can be used for precise studies of the Zeeman effect in nuclei. Iron 57 and tin 119 are two of the isotopes used in this type of spectroscopy due to narrow linewidths in their transitions. Before this technique, the large size of Doppler shifts relative to transition widths made nuclear spectroscopy problematic. It was discovered by its namesake when he was a graduate student at the Munich University of Technology. FTP, what is this effect in which a crystal lattice reduces recoil energy

A: Science
****
Q: One of this poet's works addresses the title character by saying "My tongue had taught thee comfort, touch had quenched thy tears;" that character, a sick child, would eventually be "powerful amidst peers" at the "random grim forge. " That poem, "Felix Randal," appeared in the same collection as one that calls the title month "Mary's Month," entitled "May Magnificat. " Also the author of "As Kingfishers Catch Fire," another poem asks why the title concept would "lay a lionlimb against me" and or scan "With darksome devouring eyes my bruisd bones" The title concept of a further poem "over the bent World broods with warm breast and with ah! bright wings. "The author of "Carrion Comfort" and "God's Grandeur," for 10 points, identify this poet who wrote about a "dapple dawn-drawn falcon" in his work "The Windhover,"

A: Literature
****
Q: The volume of a simplex in n dimensions can be given by the Cayley-Menger type of this function, and this function can be generalized to non-square entities using the Cauchy Binet formula. The linear independence of a set of solutions to a differential equation is given by a nonzero value for the Wronskian type of this, and changing variables when integrating a function over its domain involves the use of the Jacobian type of this function. One of these for a two-by-two matrix is used in Cramer's rule to find the solution to a system of two equations. For 10 points, name this scalar function of a square matrix, denoted by single or double bars around a matrix.

A:
Science
****