Relativity: Space, Time, Mass-Energy, and Quantum Effects
Relativity: Concepts and Postulates
The study of relativity establishes that time and space are relative; this means that they cannot be described using an absolute reference system because the measurement of space and time depends on the observer.
Einstein’s Special Theory of Relativity
In 1905, Albert Einstein published the Special Theory of Relativity, based on two postulates:
Postulates of Special Relativity
- Postulate 1: The laws of physics are the same for all reference frames moving at a constant
Understanding the Universe: Theories, Evolution, and Components
Origin of the Universe
Big Bang Theory:
Proposed by Lemaître (1927) and developed by Gamow (1948). All matter, space, and energy were initially concentrated at a single point (cosmic egg). A consequence of the instability was the large initial explosion and the beginning of the expansion of the universe. As the universe cooled gradually, elementary particles connected via electromagnetic and nuclear forces to form atoms. Thus came matter, space, and time. As the universe expanded and cooled, the
Read MoreUnderstanding Energy: Concepts, Types, and Conservation
World War
WWII is the best of all
bullets are bullets, well
assignatura: history
dica em adam
The Concept of Energy in Physics
In physics, the universal law of conservation of energy, which is the basis for the first law of thermodynamics, indicates that the energy attached to an isolated system remains constant over time. However, the theory of special relativity establishes an equivalence between mass and energy by which all bodies, by virtue of being formed of matter, contain energy. Moreover, additional
Read MoreUnderstanding Inheritance, Anatomy, and Anatomical Positions
Inheritance and Mendelism
In 1854, work began on plants to understand the principles regulating the transmission of characteristics from parents to descendants. A pure line is a group of living things that produce offspring with the same traits, generation after generation.
Mendel’s First Law
Mendel’s first law states that if you cross two pure breeds for a particular character, the descendants of the first generation are all equal to each other (both phenotype and genotype) and equal (in phenotype)
Read MoreUnderstanding Light and Vision
Light and Vision
Properties of Light
Light: An object capable of emitting light itself.
Opaque: A material that does not allow light to pass through.
Translucent: A material that allows some light to pass through.
Light Ray: A straight line representing the direction and propagation of light. It is a graphic representation with no thickness.
Light Beam: A physical representation of light. When light passes through a thin slit, it forms a beam, which has thickness.
Shadows: Formed when an object blocks
Read MoreUnderstanding Electromagnetic Radiation and Atomic Structure
Electromagnetic Radiation and Atomic Structure
Electromagnetic radiation: E-space propagation involves magnetic and electric waves.
Electric No-Load Movement: Creates magnetic and electric fields.
The nature of electromagnetic radiation is twofold:
- Corpuscular: Emission of small corpuscles or particles (Newton).
- Wave: Wave-type disturbance (Maxwell). Light has a dual nature: wave-particle.
Experimental facts that determine the structure of the atom: The experience of electrical discharges in vacuum tubes,
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