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Inside of a vacuum tube you place two electrodes and measure the current with an extremely sensitive ampere-metre. Photons of the light which hit the cathode will excite electrons causing them to leave the cathode and thereby creating a current.
With increased light intensity the current will also increase, so far nothing special. Now you can also vary the energy an electron must have in order to leave the cathode. One can do this by applying an electrical field to the electrodes. What you can observe than is from a classical point of view not explainable: From a certain voltage on you can not measure a current anymore, i.e. no electron has enough energy to leave the cathode. This voltage depends on the wave length of the light, only.
Treating light as a wave this observation can not be expected. An oscillating wave will cause the electrons to oscillate and thereby receiving kinetic energy (which eventually causes them to leave the cathode). After increasing the light intensity the necessary energy should eventually be reached. But as observed that is not the case.
The reason is that light has both properties of a wave as well as properties of a particle (wave-particle dualism). Einstein gave an explanation for the observation which is the foundation of the quantum theory. For this explanation Einstein was awarded with the Nobel price in physics.
What else can I help you with?
How many times has Albert Einstein won the Nobel Peace Prize?
Never. Albert Einstein won the Nobel Prize in physics in 1921 for his work on the photoelectric effect.
What famous scientist was awarded the 1921 Nobel Prize in Physics for his work on theoretical physics?
Albert Einstein was awarded noble prize in 1921 for his explanation of photoelectric effect.
Why did Albert Einstein win The Nobel Prize in Physics in 1921?
The Nobel Prize in Physics 1921 was awarded to Albert Einstein for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect.
Why did Andrei Dmitrievich Sakharov win The Nobel Peace Prize in 1975?
The Nobel Peace Prize 1975 was awarded to Andrei Sakharov.
What awards did Eleanor Roosevelt win?
Her accomplishment was Peace Prize , controversial peace prize.Her accomplishment was Peace Prize , controversail peace prize.
Who earned a Nobel Peace Prize for their study of the photoelectric effect?
Albert Einstein
How many times has Albert Einstein won the Nobel Peace Prize?
Never. Albert Einstein won the Nobel Prize in physics in 1921 for his work on the photoelectric effect.
Did Einstein receive the Nobel Peace Prize?
Yes, he won the Nobel Peace prize in Physics in 1921, for his services to Theoretical Physics and his discovery of the law of photoelectric effect.
For what topic did Albert Einstien win a Nobel Peace Prize?
Albert Einstein was awarded the Nobel prize for his work on the photo electric effect.
What are two Albert Einstein's important contributions?
The photoelectric effect, for which he won his Nobel Prize, and the Theory of General Relativity.
Who won the Nobel Prize for explaining the photoelectric effect?
Albert Einstein won the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect. His explanation helped confirm the particle nature of light, leading to the development of the field of quantum mechanics.
Who was the first noble prize winner for photoelectric effect in physics?
The first Nobel Prize winner for the photoelectric effect in physics was Albert Einstein in 1921. His work on the photoelectric effect helped confirm the quantum nature of light and laid the foundation for the development of quantum mechanics.
Who won the Noble Prize for the photoelectric effect?
Albert Einstein won the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect. His work laid the foundation for the development of quantum theory.
Who won the Nobel Prize for the Theory of Relativity?
I do not think anyone did. Even Einstein won the Nobel Prize not for Relativity. He won it for the Photoelectric Effect
What prize did Einstein win in 1921?
1921--Nobel Prize in Physics "for his services to theoretical physics and especially for his discovery of the law of the photoelectric effect."
Who won the Nobel Prize for his work on Photoelectric effect?
Albert Einstein won the Nobel Prize in Physics in 1921 for his work on the photoelectric effect. His findings laid the foundation for the development of quantum theory.
Why did Albert Einstein win the noble prize in chemistry?
Albert Einstein did not win the Nobel Prize in Chemistry. He won the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect, which laid the foundation for the development of quantum theory.
