Five decades of determining Planck’s constant using light emitting diodes in Undergraduate Laboratories - A Review

Authors

  • Harish V Government First Grade College, Bapujinagara, Shivamogga.
  • Shivaprasad N G Government First Grade College, Srirangapatna-571438, Karnataka
  • Ashok G V Government College, Mandya-571401, Karnataka
  • Nagendra Naik K Government First Grade College, Bapujinagara, Shivamogga.

Keywords:

Planck’s constant, Light emitting diode, Cut-off voltage, Turn-on voltage, Barrier potential, Activation voltage

Abstract

Determination Planck’s constant using LED’s has been a favourite experiment even from student perspective because of its simplicity and taught in undergraduate laboratories for the past five decades. Several modifications and improvements adopted in both experiment procedure as well as data analysis part of this experiment during this period have been revisited in paper. From the simplest experiment to determine turn-on voltages using human judgement with naked eye to advanced equipment to detect even pico ampere current flowing through LED’s have been proposed by various researchers. Many of these proposals were successful in arriving at Planck’s constant with excellent agreement with standard value. Reasons for yielding unrealistic values of Planck’s constant have also been reported by several researchers.

Author Biographies

Harish V, Government First Grade College, Bapujinagara, Shivamogga.

Government First Grade College, Bapujinagara, Shivamogga, Karnataka, India.

Shivaprasad N G, Government First Grade College, Srirangapatna-571438, Karnataka

Associate Professor of Physics

Department of Physics

Government First Grade College, Srirangapatna - 571 438, Karnataka, India.

Ashok G V, Government College, Mandya-571401, Karnataka

Associate Professor of Physics

Department of Physics

Government College, Mandya - 571 401, Karnataka, India.

Nagendra Naik K, Government First Grade College, Bapujinagara, Shivamogga.

Assistant Professor of Environmental Science

Department of Environmental Science

Government First Grade College, Bapujinagara, Shivamogga - 577 201, Karnataka, India.

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Published

2022-07-13