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ArbitrLikvidat [17]
3 years ago
9

Ultrasound with a frequency of 4.077 mhz can be used to produce images of the human body. if the speed of sound in the body is t

he same (2.31 km/s) as in salt water, what is the wavelength in the body? answer in units of m. 01
Physics
1 answer:
mestny [16]3 years ago
3 0
The frequency of the ultrasound is (converting in Hz)
f=4.077 MHz=4.077 \cdot 10^6 Hz
while the speed of sound in the body is
v=2.31 km/s = 2310 m/s

We can calculate the wavelength of the ultrasound in the body by using the relationship betwen frequency, wavelength and speed of the wave:
\lambda =  \frac{v}{f}= \frac{2310 m/s}{4.077 \cdot 10^6 Hz}=5.67 \cdot 10^{-4} m
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When driver see the child standing on road his speed is 20 m/s

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3 years ago
A car and a train move together along straight, parallel paths with the same constant cruising speed v0. At t=0 the car driver n
satela [25.4K]

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a) t1 = v0/a0

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How much time does it take for the car to come to a full stop? Express your answer in terms of v0 and a0

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B)

How much time does it take for the car to accelerate from the full stop to its original cruising speed? Express your answer in terms of v0 and a0.

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The train does not stop at the stoplight. How far behind the train is the car when the car reaches its original speed v0 again? Express the separation distance in terms of v0 and a0 . Your answer should be positive.

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