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In a laser, such as a gas discharge type laser like a mercury vapor discharge lamp, the light from the atoms is reflected to and fro between two mirrors facing each other, and is amplified (concentrated to make it more powerful) as it passes through the gas in the discharge. The lased (amplified) beam of light is so bright that it can be used to send messages to the moon or to more distant parts of the solar system.
Published by Nida Cabauatan Abarca 84 months ago in Physics | +2 votes | 0 comments
Average Speed and Velocity
Published by RAVENA 85 months ago in Physics | +2 votes | 0 comments
Physics and Technology
Published by RAVENA 85 months ago in Physics | +1 votes | 0 comments
Multiple universe and alternate reality
Published by Pradip 86 months ago in Physics | +2 votes | 0 comments
Observations on the effects of hot or cold on a rubber band: a simple Physics experiment and entropy.
Published by thestickman 89 months ago in Physics | +19 votes | 7 comments
Why is it that when we look at televised activities of astronauts, they seem to be weightless and floating around in space? And why do bodies become weightless in space? Well the common answer will be to say that this is because there is no gravity in space or that the gravitational force is at a minimum due to the distance between the object from the center of gravity. But then is this correct?
Published by Rosita Barbo 90 months ago in Physics | +9 votes | 2 comments
A photon is described as massless at rest. But does it have mass when it is moving?
Published by PG 90 months ago in Physics | +2 votes | 4 comments
What is Antimatter? A simple discussion of what is matter and antimatter as well as well as potential uses in harvesting antimatter.
Published by Rachel K. 90 months ago in Physics | +3 votes | 2 comments
A brief explication of Matter and Anti-matter. What is Anti-matter and its implications.
Published by Jerrod Nazarian 90 months ago in Physics | +6 votes | 2 comments
The Man of Speed, Ernst Mach and the Mach Number
Published by deepblue 91 months ago in Physics | +14 votes | 6 comments
This explains why a ship can float while a stone sinks. in water.
Published by Cynthia Pinga 91 months ago in Physics | +6 votes | 1 comments
This decribes the three laws of motion
Published by Cynthia Pinga 91 months ago in Physics | +7 votes | 12 comments
Is invisibility possible?
Published by Zizheng Cao 92 months ago in Physics | +3 votes | 6 comments
A very-high powered magnetic field can ‘squeeze’ a metallic coin into a smaller version of itself? It produces...shrunken coins!
Published by thestickman 92 months ago in Physics | +13 votes | 10 comments
E=MC² is an expression widely known but little understood by most who quote this expression. Interestingly, this is an algebraic expression that opened the world to things as good as nuclear energy and things as awful as nuclear bomb.
Published by Dr. Johnson C Philip 93 months ago in Physics | +29 votes | 24 comments
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