Perfectly Elastic Collision - Real World Examples

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A perfectly elastic collision is defined as a collision in which no kinetic energy is lost, meaning there is no sound or friction involved. This type of collision is primarily observed at the atomic level, such as in the interactions between gas particles. While perfectly elastic collisions are idealized concepts, they do not occur in the macroscopic world due to various energy losses. The discussion highlights the distinction between perfect and elastic collisions, emphasizing that perfect elasticity is a theoretical construct. Overall, perfectly elastic collisions are largely theoretical and not found in everyday experiences.
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What is a perfectly elastic collision?

Does it exist in the real world?
 
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Perfect elastic collision is a collision where no kinetic energy is lost during the collision (so there is no sound and no friction during the collision). This occurs on the atomic level (for example gas particles collide basically elastically)
 
i thought that's only an elastic collision?
 
comparing a flat solar panel of area 2π r² and a hemisphere of the same area, the hemispherical solar panel would only occupy the area π r² of while the flat panel would occupy an entire 2π r² of land. wouldn't the hemispherical version have the same area of panel exposed to the sun, occupy less land space and can therefore increase the number of panels one land can have fitted? this would increase the power output proportionally as well. when I searched it up I wasn't satisfied with...

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