18:37 Questions are due on Sat Oct 28, 2023 11:59 PM (5 hours from now) Question 1 (1 points) What frequency is received by a stationary mouse just before being dispatched by a hawk flying at it at 20.8 m/s and emitting a screech of frequency 3400 Hz? Assume room temperature air. Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here 3203 3203 Hz X Your Answer Saved Hz CHECK ANSWER 1 of Unlimited checks used Question 2 (1 points) Three stationary observers observe the Doppler shift from a source moving at a constant velocity. The observers are stationed as shown below Dank the Back Top Scroll to ? Questions AA kudu.com 18:37 Question 4 This question contains multiple parts. Make sure to read all the instructions and answer each part. A doppler fetal monitor is a hand-held ultrasound device that is used to detect a fetal heartbeat in prenatal care. The device works by measuring the speed of the fetus's ventricular wall and thereby tracking its heartrate. Part a (1 points) Suppose the fetus's ventricular wall moves back and forth in a pattern approximating simple harmonic motion with an amplitude of 1.7 mm and a frequency of 3.0 Hz. Find the maximum speed of the heart wall (in m/s) during this motion. Be careful of units! Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 0.032 m/s Your Answer Saved CHECK ANSWER 1 of Unlimited checks used AA Back SHOW HINT Top kudu.com Scroll to ? Questions 18:37 Part b SHOW HINT (1 points) Suppose that the ultrasound source placed on the mother's abdomen produces sound at a frequency 2 MHz (a megahertz is 106 Hz). Sound travels through tissue at roughly the same speed as in water (v 1500m/s). Find the maximum change in frequency between the sound that is emitted by the device and the sound that is observed at the wall of the baby's heart. Treat the heart wall as an observer moving towards the ultrasound source. Hint: you will need to use your answer from part (a). Give your answer as a positive number in Hz. Watch out for rounding errors that crop up if you subtract two very large numbers from each other. It is best to do everything in variables and multiply by the frequency at the very end of your calculations. Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here 2000027 2000027 Hz x Your Answer AA Back kudu.com Scroll to ? Top Questions Hz 18:38 Saved CHECK ANSWER 2 of Unlimited checks used Part c SHOW HINT (1 points) Now find the maximum difference in frequency between the ultrasound emitted by the device and the reflected sound received by the device after it bounces off the ventricular wall. This is the frequency shift that the device measures. Treat the heart wall as a moving source (moving towards the detector), emitting a wave with the frequency that you found in part (b). Give your answer as a positive number in Hz. Watch out for rounding errors! Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here No answer AA Back kudu.com Top CHECK Scroll to Hz ? Questions 18:38 Question 5 (1 points) Ocean waves move more slowly when they reach shallow water. Suppose a wave approaches the coastline as shown. Which of the rays represents a plausible path for the wave as it moves into the shallower region? Hint: make sure you draw a normal line for the boundary between the deep and shallow water! deep water Image size: S M L Max (a) (b) (c) (e) (d) shallow water Select the correct answer Saved AA Back kudu.com Top CHECK ANSWER 3 of 1 checks used Scroll to ? Questions 18:38 (a) (b) (c) (e) (d) Select the correct answer Saved Ray (b) Ray (c) Ray (e) Ray (d) Ray (a) Back Your Answer AA kudu.com ( shallow water CHECK ANSWER 3 of 4 checks used LAST ATTEMPT! Top Scroll to ? Questions