16 problems in medical physics

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1.Chuvstvitelnost inductive sensor S = 10-2 A / m. Find its threshold, if the price of dividing microammeter 1 uA.

2.Opredelitm maximum amount of blood (mass) that can pass through the aorta in 1 second. Aortic Diameter 0.02 m., Speed \u200b\u200bof blood flow in the aorta of 0.4 m / s, the density of the blood of 1.05 * 103 kg / m3.

3.Opredelit relative viscosity of blood if blood viscosity of 5 * 10-3 Pa * s, the coefficient of viscosity of water 10-3 N * s / m2.

4.Zvukovye oscillations are in the first medium in the two wavelength longer than the second (). How many times to change the speed of sound wave propagation in the transition from the first medium to another.

5.Two sound frequency of 1000 Hz differ in volume by 10 background. How many times vary in their intensity?

6.Amplituda pulse is 2.2 Q. How many divisions on the oscilloscope screen will take the momentum vertically, if the sensitivity of the oscilloscope is 0.5 cases / B.

7. When a frequency of the AC inductive reactance inductor 4 Hz is equal to capacitive reactance capacitor 25 uF.

8.Fitil raise water to a height of 80 mm. At what height on the same rise wick alcohol.

9.Na as the air pressure inside the bubble greater than atmospheric if the bubble diameter of 5 mm, N / m?

10.Opredelit ion mobility, if the voltage between the electrodes spaced 20 cm is 40 V, and the velocity of the ions is 0.01 mm / sec.

11.Rasstoyanie between the adjacent R-wave on the electrocardiogram is 30 mm. At a belt speed of 50 mm / s. determine the number of heartbeats per minute.

12.Luch light passes from the air (n1 = 1) to glass (n2 = 1,5). Determine what is the sine of the limit refraction angle.

13.Udelnoe rotation for the solution of sugar in water is 52 degrees * ml / (g * dm). At any angle of polarization plane rotates wave passing through the sugar solution concentration of 1500 mg / ml. Length 2 cm cuvette

14.Nayti the intensity of light incident on the analyzer if it is plane-polarized. The intensity of the light transmitted through the analyzer 4.4 W / m2. The angle between the planes of polarization of the light wave and the polarizer is equal to 450.

15.Skolko radon atoms disintegrates per day from 1 million. Atoms? The half-life of radon 3.82 days.

16. In medicine commonly used with cobalt atomic number and the mass number 27, 60, with a half life of 5.3 years. Determine its decay constant.


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