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Most Important Selected Qs for JEE AdvancedPhysicsWaves and Sound

Paragraph: The Doppler flow meter is a particularly interesting medical application of the Doppler effect. This device measures the speed of blood flow, using transmitting and receiving elements that are placed directly on the skin, as in Figure. The transmitter emits a continuous sound whose frequency is typically about 5 MHz . When the sound is reflected from the red blood cells, its frequency is changed in a kind

Options

  1. A1700 ~m / s
  2. B330 ~m / s
  3. C5000 ~m / s
  4. D3000 ~m / s

Correct answer

A. 1700 ~m / s

Step-by-step solution

f = C - V _ R C + V _ R f ₀ ; f f ₀ = 2 ~V _ R C + V _ R 2 ~V _ R C C = 2 0.1 600 5 10^6 1700 ~m / s

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