W7b__Pre-Lab_Quizzes_3_attempts__3LB__Basic_Physics_Lab_II

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2/20/24, 8:45 AM W7b: Pre-Lab Quizzes (3 attempts): 3LB: Basic Physics Lab II https://canvas.eee.uci.edu/courses/61657/quizzes/315036 1/4 W7b: Pre-Lab Quizzes (3 attempts) Due Feb 23 at 11:59pm Points 7 Questions 3 Available Feb 20 at 8am - Mar 14 at 11:59pm Time Limit None Allowed Attempts 3 Instructions Attempt History Attempt Time Score LATEST Attempt 1 9 minutes 7 out of 7 Score for this attempt: 7 out of 7 Submitted Feb 20 at 8:45am This attempt took 9 minutes. Question 1 3 / 3 pts The weekly pre-lab is due before the beginning of your Lab session. The problem sets will be open for one week prior to the due date. Any technical problems with the website (e.g. trouble logging on) should be reported to the OIT Help Desk staff. (https://www.oit.uci.edu/helpdesk/) If you have questions about grading or mistakes in the quiz, contact your Instructor and/or TAs. NOTE: In this Quiz, you will have THREE Attempts. Take the Quiz Again THE EAR READING 1 The function of the ossicles in the middle ear is to transmit the vibrations of the tympanic membrane caused by sound waves propagated in air to the fluid-filled cochlea. In doing so, the ossicles change the nature of the vibrations. The ear tries to conserve the energy in the wave I,
2/20/24, 8:45 AM W7b: Pre-Lab Quizzes (3 attempts): 3LB: Basic Physics Lab II https://canvas.eee.uci.edu/courses/61657/quizzes/315036 2/4 Correct! 57.2 Correct Answers where v is the wave speed, ρ is the density of the medium, v is the frequency of the wave and A is the amplitude of the wave. Calculate the ratio of the amplitude of the wave in air to the amplitude of the wave as it propagates through the cochlea. The density of air and water is 1.3x10−3g/cm3 and 1.0g/cm3, respectively, and the velocity of sound is 331 m/s in air and 1410 m/s in water. The frequency of the wave remains constant as the wave propagates. Please round your answer to one decimal place . (Hint: Begin with to find .) _______________________________[Answer} The bones in the middle ear actually give a reduction of only about 22. This figure should differ from the number you found, but remember that our calculations are only approximate and did not take into account stiffness of membranes and other factors. [10]. [10] Leonard H. Greenberg, PHYSICS FOR BIOLOGY AND PRE-MED STUDENTS, (Philadelphia: W.B. Saunders Co., 1975).
2/20/24, 8:45 AM W7b: Pre-Lab Quizzes (3 attempts): 3LB: Basic Physics Lab II https://canvas.eee.uci.edu/courses/61657/quizzes/315036 3/4 57.2 Question 2 2 / 2 pts Answer 1: Correct! 3.2 Correct! 3.2 Answer 2: Correct! 3.2 Correct! 3.2 Question 3 2 / 2 pts READING 2 The eardrum is displaced surprisingly little when a sound wave strikes it. Some idea of the displacement of the eardrum by a sound wave can be obtained by using Equation 7.1: The displacement amplitude, A, of the air molecules gives us a lower limit to the displacement of the eardrum. At the threshold of hearing at 3.4 kHz, the sound intensity is about 10 W/m . The threshold of pain begins at an intensity of 1.0W/m (19). What is the amplitude of eardrum vibrations at these intensities? The density of air is 1.3kg/m . The speed of sound is 331m/s. Please round your answers to one decimal place. (19)F. R. Hallett, P. A. Speight, R. H. Stinson, INTRODUCTORY BIOPHYSICS, (New York: John Wiley & Sons, 1977). 3.2 ________________10 nm (at threshold of hearing) (This value is ~ 3/100 the diameter of a hydrogen atom!) 3.2 ________________10 nm (at threshold of pain) −12 2 2 3 −3 3 READING 3 The auditory canal is about 2.5 cm long, and since it is much like an open-ended organ pipe, resonance can arise from the production of standing waves in the auditory canal [19]. The velocity of sound in air is
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2/20/24, 8:45 AM W7b: Pre-Lab Quizzes (3 attempts): 3LB: Basic Physics Lab II https://canvas.eee.uci.edu/courses/61657/quizzes/315036 4/4 Correct! 3310 Correct Answers 3310 Quiz Score: 7 out of 7 vair=331m/s. What is the fundamental frequency of the ear? Please round your answer to the nearest integer . (Hint: This is similar to the formants discussed in week #6.) ____________________Hz It is interesting to note that a baby's cry is at this frequency, a clever trick of nature to make sure our attention is quickly obtained [19]. [19] F. R. Hallett, P. A. Speight, R. H. Stinson, INTRODUCTORY BIOPHYSICS, (New York: John Wiley & Sons, 1977).

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