1920s

What was the significant scientific discovery in the field of physics during the 1920s?

• Theory of Relativity

• Quantum Mechanics

• Discovery of Neutron

• String Theory

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Which scientist is known for the development of quantum mechanics in the 1920s?

• Albert Einstein

• Niels Bohr

• Isaac Newton

• Galileo Galilei

In the 1920s, which model of the atom was proposed by Niels Bohr?

• Plum Pudding Model

• Planetary Model

• Quantum Model

• Solid Sphere Model

What was the primary focus of scientific research in the 1920s related to atomic structure?

• Discovery of electrons

• Understanding atomic nucleus

• Development of quantum theory

• Chemical bonding

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Which experiment in the 1920s provided evidence for the wave nature of electrons?

• Double-slit experiment

• Photoelectric effect

• Rutherford's gold foil experiment

• Millikan oil drop experiment

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What was the major advancement in chemistry during the 1920s?

• Periodic table development

• Discovery of penicillin

• Introduction of quantum chemistry

• Synthesis of plastics

Who was awarded the Nobel Prize in Physics in 1921 for his work on the photoelectric effect?

• Albert Einstein

• Max Planck

• Erwin Schrödinger

• Werner Heisenberg

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Which scientific principle was further developed in the 1920s to explain atomic spectra?

• Heisenberg Uncertainty Principle

• Bohr's Correspondence Principle

• Pauli Exclusion Principle

• Planck's Quantum Theory

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What was the impact of the discovery of quantum mechanics on scientific thought in the 1920s?

• It confirmed classical mechanics

• It introduced uncertainty and probability

• It unified all physical theories

• It was largely ignored

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Which scientist is known for formulating the uncertainty principle in the 1920s?

• Werner Heisenberg

• Niels Bohr

• Albert Einstein

• Max Born

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