医学物理历年试题2002_03partquestions.doc

Medical College of Shantou University The Test Paper of Medical Physics for 2002 Imaging Class (A) Names:___________; Registration No:____________; Total Score:_________ Multiple choice problems (3 marks for each correct answer) Four physical quantities, length, mass, time and temperature are frequently used in physics. The standard units used in physics are called International System of Units (SI). The correct units used for length, mass, time and temperature in SI are _____respectively. meter, gram, second and Kelvin, meter, kilogram, second and Kelvin, meter, kilogram, hour and Mole, meter, gram, second and condela. If a spaceship moves with a speed of 0.8c (c is light speed) and in a very strong gravitational field, the theories of _______ should be used to describe the phenomena that occur in the spaceship. Newton(s laws and special relativity quantum mechanics and special relativity general relativity and quantum mechanics special relativity and general relativity When the ideal fluid flows steadily in a horizontal pipe, the relations of the cross-section S of the pipe, the velocity v of the fluid and the pressure p of the fluid is that ______. Big S corresponds to small v and big p Big S corresponds to big v and small p Small S corresponds to big v and big p Small S corresponds to small v and big p A particle moves in two SHMs that have the same vibrational direction and same frequency. The equations of the two SHMs are given by The amplitude of the additional (superposition) vibration is _____. (a) 3 cm (b) 13 cm (c) 7 cm (d) 10 cm Which one of the following is an absolute blackbody? Answer: ______ The body that does not radiate visible light. The body that does not radiate any electromagnetic waves. The body that does not reflect visible light. The body that does not reflect any electromagnetic waves. Light is a kind of electromagnetic waves and it has the wave property of interference. If two beams of light interfere at a particular point in