1 Control of Medical Physics, Option 13

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Uploaded: 20.09.2013
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1. This density of oil and water (800 kg / m3 and 1000 kg / m3). Ultrasound reflection coefficient at the oil-water interface, if the speed of ultrasound in these environments are the same and equal to 1500 m / s.
2.Izuchenie eardrum movement showed that the rate of fluctuation of its sections is of the same order with the speed of the displacement of the air molecules in the propagation of a plane wave. On this basis calculate the approximate oscillation amplitude portions of the tympanic membrane for two cases: a) The hearing threshold, and b) the threshold of pain.
3. In some cases, the drug is dosed drops. By what percentage will change the dose of an aqueous solution of the drug at the temperature from 25 0C to 10 0C. This temperature corresponds to the surface tension of 71,78 mN / m and 74.01 mN / m.
4.Opredelit energy radiated through the surface of the window in the oven for 1 minute. The oven temperature 1500 K. viewing window area of \u200b\u200b10 cm2. take the oven emits as a black body.
5.Plosky capacitor plate spacing is 0.5 cm is charged to a potential difference of 700 V. The dielectric - blood. The relative permittivity is equal to 85. Find volumetric energy density of the capacitor field.
6.Parallelno long rectangular conductor with current at a distance of 2 mm from the electron moves at a speed of 107 m / s. With what force will act magnetic field on the electron current, if the current flows through a conductor 10A?


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