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Photo electric emission cannot be explained using wave theroy of light. We need quantum theory.
That's a mis-spelling of "quantum theory".
Quantum Theory
The quantum field theory is a theoretical framework for constructing quantum mechanical models. These models are of subatomic particles in particle physics.
Einstein's Relativity Theory is at odds with quantum physics because Einstein's theory works at a macroscopic level, while quantum physics works at an atomic level, and things at the atomic level work differently from the macroscopic level.
Photo electric emission cannot be explained using wave theroy of light. We need quantum theory.
Quantum Mechanics
Stephen L. Adler has written: 'Quantum Theory as an Emergent Phenomenon' -- subject(s): Quantum theory 'Quaternionic quantum mechanics and quantum fields' -- subject(s): Quantum theory, Quaternions, Mathematical physics, Quantum field theory
Rudolf Haag has written: 'Local quantum physics' -- subject(s): Quantum field theory, Quantum theory 'On quantum field theories' -- subject(s): Quantum theory
Heinrich Saller has written: 'Operational Quantum Theory I' 'Operational quantum theory' -- subject(s): Mathematics, Quantum theory
The original founder of quantum theory was Max Plank. The basic theory has been improved upon many times but there hasn't been a 'Modern Quantum Theory' that replaces the old.
The quantum theory of energy levels within atoms was aided by the emission spectrum. When excited with light, different elements emitted photons of different frequencies. The frequencies were different because the energy difference from excited to low energy state was different depending on the element.
The original founder of quantum theory was Max Plank. The basic theory has been improved upon many times but there hasn't been a 'Modern Quantum Theory' that replaces the old.
In short, it is called de Broglie wave (or matter wave). Which relates frequency and wavelength to momentum and energy. This relation then leads to group velocity which is an important part of quantum mechanics.
Max Karl Ernst Ludwig Planck is regarded as the founder of the quantum theory.
The quantum mechanical model is called the quantum theory.
Quantum theory was not the result of a single experiment, a single discovery, or even a single scientist. Quantum theory evolved gradually, over several decades.