PHYSCI 4th

Lunar Eclipses

Occur when the Moon passes through Earth's shadow, which is circular.

Geocentric Theory

Earth is the center of the universe according to Aristotle, with Earth at rest.

Heliocentric Theory

Sun is the center of the universe, with planets moving around it in circular paths.

Kepler's Laws of Planetary Motion

Describe planetary orbits in elliptical paths around the sun.

Newton's 1st Law

Explains that force changes an object's state of rest or motion.

Particle Theory of Light

Light consists of particles moving in straight lines, exhibiting reflection and refraction.

Wave Theory of Light

Light behaves as a wave, explaining reflection and diffraction phenomena.

Diffraction

Light bending around object edges based on wavelength and opening size.

Interference of Light

Multiple light waves interacting, altering combined amplitudes.

Radio Waves

Longest wavelengths in the electromagnetic spectrum, used in radio transmission and GPS.

Lunar Eclipses

Occur when the Moon passes through Earth's shadow.

Geocentric Theory

Belief that Earth is the center of the universe.

Heliocentric Theory

Theory with the Sun at the center, planets orbiting.

Tycho Brahe

Made precise measurements of stars and planets.

Johannes Kepler

Concluded planets move in elliptical paths.

Law of Orbits

States planets move in elliptical paths around the sun.

Law of Equal Areas

Relates to time and distance of planet revolutions.

Aristotelian Mechanics

Describes natural and violent motion, celestial governed by ether.

Galilean Conceptions

Objects move at constant velocity unless acted upon by a force.

Newton's 1st Law

Force changes an object's state of rest or motion.

Particle Theory of Light

Light consists of particles moving in straight lines.

Wave Theory of Light

Light behaves as a wave, explaining reflection and refraction.

Diffraction

Light bending around object edges based on wavelength.

Interference of Light

Multiple light waves interacting, altering combined amplitudes.

Polarized Light Waves

Vibrations in a single plane, achieved through polarization.

Photon Concept

Light waves behaving as particles called photons.

Reflection on Spoon

Concave mirror reflects light outward, creating inverted images.

Mirage

Caused by light refraction due to hot ground warming air.

Cellophane and Light

Absorbs certain colors, allowing specific light to pass.

Natural Light Phenomena

Haloes, rainbows, and bows from light refraction, reflection.

Radio Waves

Longest wavelengths in the electromagnetic spectrum.

Global Positioning Systems (GPS)

Determines location by measuring radio wave travel time from satellites.