Physics 30 June 01 Diploma Exam

Radio telescopes radio telescopes detect radio waves

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Unformatted text preview: nticton, BC, has a seven-antenna radio telescope. Using signals from this telescope, DRAO produces detailed wide-angle pictures of the radio sky. One of the radio waves that this telescope can detect has a frequency of 1 420 MHz, and comes from an arm of the Milky Way Galaxy that is 7.00 × 1018 km away. 22. The amount of time, in days, that it takes the radio waves detected by the telescope to reach Earth is A. B. C. D. 23. 2.7 × 108 days 6.5 × 109 days 2.3 × 1013 days 2.0 × 1018 days DRAO is located in a basin surrounded by mountains, which shield it from manmade radio waves that interfere with astronomical signals. Manmade radio waves are produced by A. B. C. D. radioactive decay electron transitions in atoms oscillating charges in a linear antenna high speed electrons stopped suddenly by a metal surface 16 Use the following information to answer the next question. A proton enters a magnetic field at a right angle to the field. An alpha particle enters the same field at the same angle but with twice the speed. Once in the magnetic field, both particles move in a circular path. 24. The ratio of radius of the alpha particle’s path to the radius of the proton’s path is A. B. C. D. 25. 1:1 2:1 4:1 8:1 Which of the following forms of electromagnetic radiation has photons of lowest energy? A. Radio waves B. C. D. Ultraviolet light Gamma radiation Infrared radiation Numerical Response 8. If certain X-rays have a frequency of 2.15 × 1020 Hz, then the period of these X-rays, expressed in scientific notation, is b × 10–w s. The value of b is __________. (Record your three-digit answer in the numerical-response section on the answer sheet.) 17 26. Maxwell’s work contained the new idea that A. B. C. D. 27. an electric current in a wire produces a magnetic field that circles the wire a current is induced in a conductor that moves across a magnetic field an electric field that changes with time generates a magnetic field two parallel, current-carrying wires exert a force on each other Evidence of the wave-like properties of matter can be found in the A. B. C. D. 28. refraction of light diffraction of electrons Compton scattering of X-ray photons conservation of momentum of photons Which of the following types of radiation can be deflected by both electric fields and magnetic fields? A. B. C. D. X-rays Cathode rays Photon beams Electromagnetic waves 18 Use the following information to answer the next question. When a certain metal is struck by a photon with a frequency of 8.23 × 1014 Hz, the metal emits an electron with a maximum speed of 2.45 × 105 m/s. Numerical Response 9. The work function for this metal is __________ eV. (Record your three-digit answer in the numerical-response section on the answer sheet.) 29. In his explanation of the photoelectric effect, Einstein proposed that A. B. C. D. the speed of light is constant light energy is concentrated in distinct “packets” light energy is evenly distributed over the entire wave front metallic surfaces emit electrons when illuminated with short-wavelengt...
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This note was uploaded on 01/14/2014 for the course PHYSICS Physics 30 taught by Professor Quinlan during the Fall '09 term at Centennial High School.

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