How We Know Black Holes Exist?

How We Know Black Holes Exist?

This video is about the astronomical amount of astronomical evidence for black holes, ranging from x-ray binaries with accretion disks, supermassive infrared-radiating galactic nuclei black holes, orbital characteristics of high mass binaries, and direct gravitational...
Centripetal Acceleration

Centripetal Acceleration

Introduction Take your students on an amusement park ride—for just a penny! Discuss how an object can be accelerating yet moving at constant speed. Investigate how a change in direction (at constant speed) is acceleration; that is, centripetal acceleration! Discussion...
What is a photon?

What is a photon?

A photon is a purely quantum mechanical object representing the smallest piece of energy (or quanta) for light. Every quantum particle is a packet of energy though, so how do we tell photons apart from electrons, quarks, and neutrinos? Click here to go the source for...
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