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Physics

CAIE2023

(a) The quality of an image produced using X-rays depends on sharpness and contrast. State what is meant by (i) sharpness, (ii) contrast. [2] (b) A parallel beam of X-ray photons is produced by an X-ray tube with 80keV between the anode and cathode. The beam has its intensity reduced to one half of its original value when it passes through a thickness of 1.0 mm of copper. (i) Determine the linear absorption coefficient µ of the X-ray photons in copper. µ = mm-1 [2] (ii) Suggest, with a reason, the effect on the linear absorption coefficient if the beam is comprised of 100keV photons. [2] © UCLES 2005 9702/04/SPECIMEN PAPER PPPMMMTTT

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Physics

CAIE2016

(a) The quality of an image produced using X-rays depends on sharpness and contrast. State what is meant by (i) sharpness, ........................................................................................................................................... ...................................................................................................................................... [1] (ii) contrast. ........................................................................................................................................... ...................................................................................................................................... [1] (b) A parallel beam of X-ray photons is produced by an X-ray tube with 80 kV between anode and cathode. The beam has its intensity reduced to one half of its original value when it passes through a thickness of 1.0 mm of copper. (i) Determine the linear absorption (attenuation) coeffi cient µ of the X-ray photons in the copper. µ = ................................................ mm−1 [2] (ii) Suggest, with a reason, the effect on the linear absorption coeffi cient if the beam is comprised of 100 keV photons. ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2] [Total: 6] © UCLES 2014 9702/04/SP/16 [Turn over PPMMTT

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