What is the purpose of light? How does light work? Why does Light exist? There had been a controversy about whether light was particles or waves. Albert Einstein showed that light must come in discrete packets of energy which today we...

We deal with light on a daily basis, and it has wave-like characteristics that are essential to many natural and technological processes. The wave nature of light aids in the explanation of a number of important optical phenomena,...

Electromagnetic waves are fundamental to understanding the nature of light and are oscillations of electric and magnetic fields that travel through space, carrying energy from one place to another. The spectrum of light is a small...

Upon viewing the The Nature of Waves video series, students will be able to do the following: Define waves as traveling disturbances that carry energy through matter or space. Explain that waves do not actually move matter. Instead,...

When light hits something, a number of things can happen: it can be reflected, refracted, diffracted or absorbed. But what does this mean? Physics - Waves - Learning Points. Manipulation of light is vital to our survival. Light waves...

SUMMARY Why does the speed of light change in different media? or Does it? How photons always travel at the same speed, but the speed of light changes. In 1905 Einstein proposed the theory of special relativity. One of the postulates was...

Summary: If you point a powerful laser at the moon, and spin it 100 times per second, the dot on the moon will move 3X the speed of light. This is ok. The maximum speed limit is not a limit with which things can move, but is a limit on...

What is Dark Matter? -- What if I told you that there may be trillions of particles going through your body right now, and you can’t see it, hear it, or touch it. And that these particles are so vast, that they compose more than 6 times...

The video explains the basics of electromagnetic waves, including their definition as transverse waves that transfer energy from a source to an absorber. It discusses the seven general sections of the electromagnetic spectrum, going from...

Where are you right now? Until you interact with another particle you could be any number of places within a wave of probabilities. This is only one way that quantum mechanics challenges our perception of reality. Matt dives into these...

Five areas of physics worth remembering: Classical mechanics, energy and thermodynamics, electromagnetism, Relativity, and Quantum Mechanics. Classical mechanics - two main concepts worth knowing. The first is Newton’s second law: F= ma:...

After passing its last critical design review in February 2020, PACE has entered its integration and testing phase of development. PACE's primary sensor, the Ocean Color Instrument (OCI), is a highly advanced optical spectrometer that...

This video is about two-photon (gamma-gamma) physics, and how photons can interact with each other - either mediated by a passing lepton, or gravitationally via lensing, or via vacuum fluctuation pair production of vertical particles...

Summary: The information that we know about the universe comes almost exclusively from the analysis of electromagnetic radiation. But there is only so much this light can reveal because there is an inherent barrier. The oldest light that...

This video explores the characteristics of waves. It explains the speed of waves, how this value is calculated and the four basic interaction between waves. Other terminology includes: vibration, crest, trough, amplitude, wavelength,...

This video explores the characteristics of waves. It explains the speed of waves, how this value is calculated and the four basic interaction between waves. Other terminology includes: vibration, crest, trough, amplitude, wavelength,...

Then Isaac Newton in 1687 showed that planets move due to the same forces we experience here on earth. If things could be explained with mathematics, to many people this called into question the need for a God. But in the late 20th...

Quantum physics simplified. Are Consciousness and Free Will linked to quantum mechanics? The double slit experiment explained. What is the difference between observation and measurement? Since Quantum Mechanics is the basis of all modern...

Unprecedented observations of a nova outburst in 2018 by a trio of satellites, including NASA’s Fermi and NuSTAR space telescopes, have captured the first direct evidence that most of the explosion’s visible light arose from shock waves...

SUMMARY: Quantum field theory or QFT is the basis of the best theory we have in physics today to explain nearly everything, called the Standard Model of particle physics. What is Quantum Field theory? Why is it necessary? How is it...

According to Einstein, whenever massive objects interact, they produce gravitational waves -- distortions in the very fabric of space and time -- that ripple outward across the universe at the speed of light. While astronomers have found...

The video discusses the concept of reflection, including the difference between specular and diffused reflection and how light interacts with irregular surfaces. It also includes a quiz to test the viewer's knowledge.

Scientists using data from NASA's Fermi Gamma-ray Space Telescope have measured all the starlight produced over 90 percent of the universe's history. The analysis, which examines the gamma-ray output of distant galaxies, estimates the...

The photoelectric effect is a phenomenon that occurs when light, consisting of photons, interacts with the inner structure of an atom. Photons carry a specific amount of energy proportional to their frequency, which is transferred to an...