Question:  The Wu experiment was conducted by the physicist who was part of what field of study?
Context: The Monster Study was a stuttering experiment performed on 22 orphan children in Davenport, Iowa in 1939.  It was conducted by Wendell Johnson at the University of Iowa.  Graduate student Mary Tudor conducted the experiment under Johnson's supervision.  Half of the children received positive speech therapy, praising the fluency of their speech, and the other half, negative speech therapy, belittling the children for speech imperfections.  Many of the normal speaking orphan children who received negative therapy in the experiment suffered negative psychological effects and some retained speech problems for the rest of their lives. Kettlewell's experiment was a biological experiment in the mid-1950s to study the evolutionary mechanism of industrial melanism in the peppered moth ("Biston betularia").  It was executed by Bernard Kettlewell, who was working as research fellow in the Department of Zoology, University of Oxford.  His aim was to investigate the scientific reason for the appearance of dark-coloured moth since Industrial Revolution in England in the 19th century.  He conducted his first experiment in 1953 in the polluted woodland of Birmingham, and his second experiment in 1955 in Birmingham as well as in the clean woods of Dorset. The Tuskegee Study of Untreated Syphilis in the Negro Male, also known as the Tuskegee Syphilis Study or Tuskegee Syphilis Experiment ( ) was an infamous clinical study conducted between 1932 and 1972 by the U.S. Public Health Service.  The purpose of this study was to observe the natural progression of untreated syphilis in rural African-American men in Alabama under the guise of receiving free health care from the United States government. Gustav III of Sweden's coffee experiment was a twin study ordered by the king to study the health effects of coffee.  Although the authenticity of the event has been questioned, the experiment, which was conducted in the second half of the 18th century, failed to prove that coffee was a dangerous beverage. The Spring Grove Experiment is a series of lysergic acid diethylamide (LSD) studies performed from 1963 to 1976 on patients with psychotic illnesses at the Spring Grove Clinic in Catonsville, Maryland.  These patients were sponsored by a federal agency called the National Institute of Mental Health to be part of the first study conducted on the effects of psychedelic drugs on schizophrenics.  Then, the Spring Grove Experiments were adapted to study the effect of LSD and psychotherapy on patients including alcoholics, heroin addicts, neurotics, and terminally-ill cancer patients.  The research done was largely conducted by the members of the Research Unit of Spring Grove State Hospital.  Significant contributors to the experiments included Walter Pahnke, Albert Kurland, Gloria, Sanford Unger, Eric Kast, Richard Yensen, Stanislav Grof and Oliver Lee McCabe.  Later, Spring Grove was rebuilt into the Maryland Psychiatric Center, where studies continued to be performed for the advancement of psychiatric research.  This study on LSD is the largest study on psychedelic drugs to date. The Wu experiment was a nuclear physics experiment conducted in 1956 by the Chinese American physicist Chien-Shiung Wu in collaboration with the Low Temperature Group of the US National Bureau of Standards.  The experiment's purpose was to establish whether or not conservation of parity ("P"-conservation), which was previously established in the electromagnetic and strong interactions, also applied to weak interactions.  If "P"-conservation were true, a mirrored version of the world (where left is right and right is left) would behave as the mirror image of the current world.  If "P"-conservation were violated, then it would be possible to distinguish between a mirrored version of the world and the mirror image of the current world. The kerplunk experiment was a famous stimulus and response experiment conducted on rats and demonstrates the ability to turn voluntary motor responses into a conditioned response.  The purpose of the experiment was to get kinaesthetic feedback rather than guidance through external stimuli through maze learning.  It was conducted in 1907 by John B. Watson and Harvey A. Carr and was named after the sound the rat made after running into the end of the maze.  The study would help form a chain of responses hypothesis proposed by Watson. A web-based experiment or Internet-based experiment is an experiment that is conducted over the Internet.  In such experiments, the Internet is either "a "medium" through which to target larger and more diverse samples with reduced administrative and financial costs" or "a "field" of social science research in its own right."  Psychology and Internet studies are probably the disciplines that have used these experiments most widely, although a range of other disciplines including political science and economics also use web-based experiments.  Within psychology most web-based experiments are conducted in the areas of cognitive psychology and social psychology.  This form of experimental setup has become increasingly popular because researchers can cheaply collect large amounts of data from a wider range of locations and people.  A web-based experiment is a type of online research method. The Rosenhan experiment was an experiment conducted to determine the validity of psychiatric diagnosis.  The experimenters feigned hallucinations to enter psychiatric hospitals, and acted normally afterwards.  They were diagnosed with psychiatric disorders and were given antipsychotic drugs.  The study was conducted by psychologist David Rosenhan, a Stanford University professor, and published by the journal "Science" in 1973 under the title "On being sane in insane places".  It is considered an important and influential criticism of psychiatric diagnosis. Chien-Shiung Wu (; May 31, 1912 – February 16, 1997) was a Chinese-American experimental physicist who made significant contributions in the field of nuclear physics.  Wu worked on the Manhattan Project, where she helped develop the process for separating uranium metal into uranium-235 and uranium-238 isotopes by gaseous diffusion.  She is best known for conducting the Wu experiment, which contradicted the hypothetical law of conservation of parity.  This discovery resulted in her colleagues Tsung-Dao Lee and Chen-Ning Yang winning the 1957 Nobel Prize in physics, and also earned Wu the inaugural Wolf Prize in Physics a mere two decades later in 1978.  Her expertise in experimental physics evoked comparisons to Marie Curie.  Her nicknames include "the First Lady of Physics", "the Chinese Madame Curie", and the "Queen of Nuclear Research".
Answer: nuclear physics