PHYS_101_Quiz_week_6.docx

PHYS_101_Quiz_week_ User Course 202140 Fall 2021 PHYS 101-D01 LUO Test Quiz: Waves and Sound Started Submitted Due Date 12/6/21 11:59 PM Status Needs Grading Attempt Score Grade not available. Time Elapsed 54 minutes out of 1 hour and 30 minutes Instructions  Time limit: 1 hour and 30 minutes  25 true/false and multiple-choice questions and 1 multi-part essay question  Open-book/open-notes  Do not hit the BACK button as this will lock you out of the quiz.  The timer will continue if you leave this quiz without submitting it. Results Displayed Submitted Answers, Feedback  Question 1 2 out of 2 points You are on a boat in a fog and know there are cliffs ahead of you somewhere, but you cannot see them. You use your fog horn to send out a blast of sound (assume the temperature of the air is 20 oC) and the time it takes for the sound to return to you is 20.0 s. How far away are the cliffs (in metric units)? Hint: Be careful and think about the physics of the problem. You may want to make a sketch of the situation to help you determine the answer. Selected Answer: b. 3444 m  Question 2 2 out of 2 points A source emits sound at a fixed constant frequency f. If the source moves away from you, and at the same time you run away from the source, the frequency you hear is Selected Answer: d. lower than f.