Ultrasound is utilized in measuring blood flow non-invasively using a phenomenon referred to as Doppler Effect. a. Derive the expression of the Doppler shift. [10] b. A horseshoe bat flies towards a moth at vb = 9 m/s, while the moth flies towards the bat at vm = 8 m/s. The bat emits ultrasonic waves of frequency fbe that reflect from the moth back to the bat with frequency fbd. The bat adjusts the emitted fbe so that fbd = 83 kHz, its optimal hearing frequency. i. Find the frequency fm heard and reflected by the moth. [2] ii. Calculate the frequency fbe emitted by the bat. [2] c. In several cases, a nearby star has been found to have a large planet orbiting about it, although the planet could not be seen. Using the ideas of a system rotating about its centre of mass and of the Doppler shift for light (which is in several ways similar to the Doppler Effect for sound), explain how an astronomer could determine the presence of the invisible planet
Answers: 3
Physics, 22.06.2019 11:00
What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?
Answers: 1
Physics, 22.06.2019 22:00
Ahurricane sweeps across the ocean and damages the houses of people living along the coast. which of these does not play any role in this interaction? air water glaciers living things
Answers: 1
Physics, 23.06.2019 03:00
Suppose the house in question 3 is located in cleveland where the annual average solar flux is 160 w/m2 . if 10 m2 of solar panels operating at 20 percent efficiency were installed on this house to collect and store solar energy in the form of hot water:
Answers: 2
Physics, 23.06.2019 10:00
4. a car with a mass of 2,200 kg can accelerate from 0 to 30 m/s in 6 seconds. a. assuming all of the force generated by the engine goes into acceleration of the car, how much force is the engine producing? show your work. (6 points)
Answers: 1
Ultrasound is utilized in measuring blood flow non-invasively using a phenomenon referred to as Dopp...
Health, 27.06.2021 02:20
World Languages, 27.06.2021 02:20
English, 27.06.2021 02:20
Mathematics, 27.06.2021 02:20
Physics, 27.06.2021 02:20
Social Studies, 27.06.2021 02:20
Mathematics, 27.06.2021 02:20
Mathematics, 27.06.2021 02:20
History, 27.06.2021 02:20
Mathematics, 27.06.2021 02:20