{"id":"S85041189","label":"Effective mass (Physics)","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85041189","normalized_label":"effective mass (physics)","broader":["http://id.loc.gov/authorities/subjects/sh85043122","http://id.loc.gov/authorities/subjects/sh85051660","http://id.loc.gov/authorities/subjects/sh85081853"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85041189","provider":"lcsh","revision":"208b44a4cd24181a","taxonomy_revision":"f050b5d4780b1289","title":"Effective mass (Physics)","url":"/topics/S85041189","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9513867682911486464","address_version":"morton4x16-v1","coordinates":[0,20,18048,37888],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}