Learn about cosmic rays in physics and cosmology. Get the definition, learn about particle showers, and see whether cosmic rays are dangerous.| Science Notes and Projects
Learn what an exact number is in chemistry, physics, and math. Get the definition and examples of exact numbers.| Science Notes and Projects
Learn how to use the time between lightning and thunder to tell how far away lightning is. See how many seconds indicates one mile.| Science Notes and Projects
Learn what the electromagnetic spectrum is. Get the definition, diagram, and explanation of the different forms of electromagnetic radiation.| Science Notes and Projects
Learn what causes thunder and lightning and get interesting facts about how thunder and lightning work in storms.| Science Notes and Projects
Learn about refraction in physics. Get its definition and explore Snell's law and the index of refraction. Get examples for light and sound.| Science Notes and Projects
Learn about Compton scattering or the Compton effect. Discover how it works and its formula, example problem, importance, and uses.| Science Notes and Projects
Discover what a solar flare is, how it works, and what its effects are on Earth and space. Get examples of large solar flares.| Science Notes and Projects
Learn about alpha particles. Get the definition and learn about the alpha particle symbol and charge. See the reaction for alpha decay.| Science Notes and Projects
Get the scientific theory definition and examples. Understand theory uses and limitations. Learn how a theory differs from a law in science.| Science Notes and Projects
Learn about momentum in physics. Get its definition, units, formula, and worked example problems. See how it relates to Newton's laws.| Science Notes and Projects
Learn about escape velocity in physics. Get the escape velocity definition and formula and see the speeds for the Earth, Moon, and planets.| Science Notes and Projects
Radio waves are low-frequency electromagnetic waves used in communication, radar, and astronomy. Discover their sources, uses, and effects.| Science Notes and Projects
Learn what the Doppler effect or Doppler shift is in physics. Get a simple definition and get examples and formulas for sound and light.| Science Notes and Projects
Learn about the seven SI base units of measurement. Get their abbreviations and learn how they are defined.| Science Notes and Projects
Learn about the astronomical unit (au or AU) in astronomy. Get the definition, example distances, history, and worked problems.| Science Notes and Projects
Learn about gamma rays or gamma radiation. Discover their properties, sources, health hazards, detection, and uses.| Science Notes and Projects
Learn about photons in physics. Get the photon definition and fun facts about this interesting unit of light.| Science Notes and Projects
Learn about Newton's second law of motion in physics. Discover its formula, example problems, history, and practical applications.| Science Notes and Projects
Learn about Newton's laws of motion. Learn about the three laws and get examples of each law in everyday life.| Science Notes and Projects
Get the definition of a light year in astronomy. See examples of distances in light years and how the unit compares with parsecs and AU.| Science Notes and Projects
A simple equation relates wavelength to frequency. See examples converting between wavelength and frequency for light and sound.| Science Notes and Projects