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A proposed scientific idea is called a hypothesis. This is a tentative explanation for a phenomenon that can be tested through observations and experiments. If the hypothesis is supported by evidence, it may become a theory in the scientific community.
A testable prediction in the scientific method is called a hypothesis. This is a proposed explanation or educated guess about an observed phenomenon that can be tested through experiments or observations.
Max Planck proposed that energy is radiated in discrete packets called "quanta." This idea laid the foundation for the development of quantum theory.
The proposed individual indivisible particles were atoms, and this idea laid the foundation for modern atomic theory. Although he lacked experimental evidence at the time, subsequent scientific discoveries have validated the existence of atoms as building blocks of matter.
Albert Einstein proposed the idea that light consists of quanta of energy in his paper on the photoelectric effect in 1905. This revolutionary concept helped to explain certain observations that the wave theory of light could not account for, and laid the foundation for the later development of the field of quantum mechanics.
Democritus developed the concept of atomism, which proposed that all matter is composed of tiny, indivisible particles called atoms. He believed that atoms are constantly in motion and that differences in atoms' size, shape, and arrangement determine the properties of the substances they make up. This idea laid the foundation for modern atomic theory.