AST201_Homework_2__AST201H1_S_LEC0101_20241_Stars_and_Galaxies (4).pdf

1/28/24, 8:44 AM AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies https://q.utoronto.ca/courses/336471/quizzes/373183 1/6 AST201 Homework 2 Due Feb 1 at 2p.m. Points 9 Questions 9 Available Jan 25 at 3p.m. - Apr 9 at 11:59p.m. Time Limit None Allowed Attempts 3 Attempt History Attempt Time Score KEPT Attempt 1 28 minutes 6.83 out of 9 LATEST Attempt 2 24 minutes 6.17 out of 9 Attempt 1 28 minutes 6.83 out of 9  Correct answers will be available on Feb 1 at 2p.m.. Score for this attempt: 6.17 out of 9 Submitted Jan 28 at 8:43a.m. This attempt took 24 minutes. Take the Quiz Again 1 / 1 pts Question 1 Which of the following would be true if the Sun were gently compressed to form a black hole, without changing its mass? Earth’s orbit would become elongated. The black hole would quickly suck in Earth. Earth would gradually spiral into the black hole. Earth would remain in the same orbit.

1/28/24, 8:44 AM AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies https://q.utoronto.ca/courses/336471/quizzes/373183 2/6 The Sun’s event horizon would reach the present location of Mercury. 1 / 1 pts Question 2 Which of the following statements about the fundamental forces is true? Electrons are the carrier particles of the electromagnetic force. The strong nuclear force is responsible for holding electrons in orbit around atomic nuclei. The weak nuclear force is the weakest of the four fundamental forces. Photons are the carrier particles of the electromagnetic force. The strong nuclear force can act over an infinite range of distances. 1 / 1 pts Question 3 Which of the following is a true statement about an event horizon? Light can escape the event horizon, but matter cannot. Event horizons are theoretical boundaries that have no relationship with reality. The event horizon is the very centre of the black hole. The event horizon looks black because light cannot escape it. The radius of the event horizon is called the Hawking radius.

1/28/24, 8:44 AM AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies https://q.utoronto.ca/courses/336471/quizzes/373183 3/6 0.5 / 1 pts Question 4 Partial Partial Which of the following methods have been used to establish the existence of black holes? Select all that apply. Sending space telescopes to visit black holes and take pictures of them up close. Using global telescope networks to take images of supermassive black holes. Observing that there is a large amount of ‘missing mass’ in galaxy clusters that can’t be seen with telescopes. Observations of x-ray emissions from binary star systems. Measuring how the precession of the perihelion of Mercury is affected by the supermassive black hole at the center of our galaxy. 1 / 1 pts Question 5 Which of the following statements are true regarding black holes? Select all that apply. At their centers, small galaxies have stellar-mass black holes while large galaxies have supermassive black holes.

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