In 1968, x won nobel prize in physics. x discovered the iridium layer and also he had given a theory that dinosaurs were driven to extinction by the aftermath of a large meteorite impact on earth. identify x.

Question: In 1968, x won nobel prize in physics. x discovered the iridium layer and also he had given a theory that dinosaurs were driven to extinction by the aftermath of a large meteorite impact on earth. identify x.

The person you are looking for is Luis Walter Alvarez. He won the 1968 Nobel Prize in Physics for his work on elementary particle physics, specifically the development of the hydrogen bubble chamber and the discovery of new resonance states.

In 1980, Alvarez and his son, geologist Walter Alvarez, discovered a band of sedimentary rock that contained unusually high levels of a rare element, iridium. This band of rock, which is found all over the world, is now known as the iridium layer. The Alvarezes hypothesized that the iridium layer was the result of a large meteorite impact that occurred 65 million years ago. This impact, they argued, would have caused a global catastrophe that led to the extinction of the dinosaurs and many other species.

The Alvarezes' theory is now widely accepted by scientists. The Chicxulub crater in Mexico is believed to be the site of the impact that caused the iridium layer. The crater is about 180 kilometers wide and was formed about 66 million years ago.

Luis Alvarez died in 1988, but his work continues to have a profound impact on our understanding of the Earth's history. His discovery of the iridium layer and his theory of the dinosaur extinction have helped us to better understand the forces that shape our planet.