TAILIEUCHUNG - Delta's key the toefl test part 48

Tham khảo tài liệu 'delta's key the toefl test part 48', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Quiz 10 _l ASSESSING PROGRESS - through Quiz 10 Time - 22 minutes Read the following passages and choose the one best answer to each question. Answer all questions on the basis of what is stated or implied in that passage. Questions 1-10 No actual black hole has yet been located or studied but the concept has provided endless imaginative fodder for science fiction writers and endless theoretical fodder for physicists and astrophysicists. Black holes are one of the more exotic theoretical manifestations of general 5 relativity. The standard model for the formation of a black hole involves the collapse of a large star. For extremely massive stars that are four to five times the mass of our sun the exclusion principle the resistance between the molecular particles within the star as they are compressed- will not be strong enough to offset the gravity generated by the star s own mass. The star s increasing density will overwhelm the exclusion principle. What 10 follows is runaway gravitational collapse. With no internal force to stop it the star will simply continue to collapse in on itself until it reaches a point of infinite density and zero volume a phenomenon known as a singularity. The star now disappears from the perceivable universe like a cartoon character who jumps into a hole and pulls the hole in after him. What this process leaves behind is 15 a different kind of hole a profound disturbance in spacetime a region where gravity is so intense that nothing not even light can escape from it. Any object falling within the boundary of a black hole will be sucked in and will disappear from our universe forever. What would happen to an object such as an astronaut as it vanished into the black hole Physicists have been amusing themselves with this question for years. Most 20 believe that the astronaut would be destroyed by the intense gravitational forces within the black hole or would explode in a flash of gamma rays as he or she approached the singularity .

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