Download Unit of Light Year - Physics - Past Exam and more Exams Physics in PDF only on Docsity! 1 UNIVERSE AS AN ART Paper PH1.F ( 3 hours ) ------------------------------------------------------------------------------------------------------------------- Section A - Candidates should answer all multiple choice questions on the special answer sheet provided. Total 30 marks. Suggested time: 45 minutes. Section B - Candidates should write 3 essays from the list of titles given in Section B. You must not choose more than one from each module subsection. Use a separate answer book for each essay. Total 30 marks per essay. Suggested time: 45 minutes per essay. SECTION A (Only one of the options is correct) (PHYS121) 1 A „light year‟ is a unit of a) time, b) distance, c) mass. 2 The light we observe from star that is rapidly receding from us will be red shifted compared with that of an identical and stationary star, i.e. the light from the receding star will a) have a shorter wavelength and be of higher energy, b) have a longer wavelength and be of higher energy, c) have a longer wavelength and be of lower energy. 3 Which of the following reasons for using mirrors rather than lenses in large telescopes is not correct? a) Mirrors do not suffer from chromatic aberration. b) More light will be incident on a mirror than a lens of the same diameter. c) A mirror will weigh less than a lens of the same diameter. 4 The centre of the Sun is at a temperature of about a) 1.6×10 6 °C, b) 1.6×10 7 °C, c) 1.6×10 8 °C. L A N C A S T E R U N I V E R S I T Y 2009 EXAMINATIONS 2 5 A main sequence star a) generates energy by nuclear fission, b) occupies the lower left corner of the Hertzsprung-Russell diagram, c) produces He. 6 Which of the following is not the result of a supernova explosion? a) A pulsar. b) A neutron star. c) A white dwarf. (PHYS122) 7 Near a heavy star, is a beam of light a) deflected towards the star, b) deflected away from the star c) undeflected? 8 If you drive at near light speed through a forest, would the trees seem to a) bend towards you b) bend away from you c) be unchanged? 9 At the event horizon (surface) of a Black Hole does spacetime become a) infinitely large, b) infinitely small, c) inverted? 10 If you compare a moving clock with the one you have in your hand, is the moving clock running a) slower, b) faster, c) at the same speed as yours? 11 When you approach a yellow traffic light at high speed does it look a) redder, b) bluer, c) as yellow as ever? 12 At what speed do we travel through spacetime? a) At the speed of light. b) At the speed of sound. c) At our own velocity.
