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Essay Physics Essay
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1. (a) Describe how you would measure the thermal conductivity of a liquid, which is a poor conductor of heat, pointing out the precautions you would take to ensure an accurate result. (b) Explain ... (i) the observed difference between the temperatures of the seawater and the air during the night-time in the autumn in Hong Kong, and (ii) the survival of fish in frozen-over ponds during the winter in North China. 2. Give accounts of the physics of the working of (a) a Geiger-Muller tube, and (b) a cloud chamber, in their use to detect ionizing radiations, contrasting the different techniques which would have to be used to distinguish between , and radiations. 3. Explain form first principles the following phenomena: (a) The colours observed when viewing an oil film on water, giving the reasons why the film must be thin, and (b) the absence of high frequencies to an observer standing outside and to the side of an open door leading into a room where music is being played. (Consider velocity of sound = 340 m/s.) [Show More]
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