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Ludmilka [50]
3 years ago
7

A certain ultrasound device can measure a fetal heart rate as low as 50 beats per minute. This corresponds to the surface of the

heart moving at about 4.0 x 10-4 m/s. If the probe generates ultrasound that has a frequency of 2.0 MHz (1 MHz = 1 megahertz = 106 Hz), what frequency shift must the machine be able to detect
Physics
1 answer:
balu736 [363]3 years ago
7 0

Answer:

The. Machine must detect a shift of

1 Hz

Explanation:

Frequency shift is given as

={ ( Vsound +V/ V sound -V) -1}f emitted

So by substitution we have

= { 1540+4E-4/1540-4E)-1) 2*10^6

= 1Hz

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Answer:

Explanation:

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e^{\lambda_2 t} = 5  e^{\lambda_1 t}

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Putting t = 2 h , λ₁ = .9 h⁻¹

e^{\lambda_2\times  2} = 5  e^{.9\times  2}

e^{\lambda_2\times  2} = 30.25

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λ₂ = 1.7047

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= .4065 hours .

= .41 hours .

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