Question 11 (1 points) Sound is a longitudinal wave that travels at speed 343 m/s in dry air at room temperature and standard pressure. Your ear is capable of differentiating sounds that arrive at the ear just 1 .00 milliseconds apart. What is the minimum distance between two speakers that produce sounds that arrive at noticeably different times? Select the correct answer Saved 1 of 3 checks used 343 o 8- cm 0 343 m 0 3.43 m 0 3.43 cm AA kudu.com CL Two car horns are sounded creating two sound waves with frequencies that differ by a factor of three. How does the speed of the higher frequency sound wave compare to the lower frequency sound wave? Select the correct answer No answer submitted 0 of 3 checks used The lower frequency sound wave travels 3 times faster 0 0 Both travel at the same speed The higher frequency sound wave travels 9 times faster 0 The higher frequency sound wave travels 3 times faster 0 Could be either sound wave, more information is needed 0 The lower frequency sound wave travels 9 times faster 0 AA kudu.com CL Question 13 This question contains multiple parts, Make sure to read all the instructions and answer each part. A sound wave with a pitch of 261 .6Hz (middle C) is played in a warm concert hall, where the air temperature is 2500. A passerby in the cold winter street outside hears the note coming through a window. The air temperature outside is 5OC. Part a (1 points) What will be the frequency of the sound heard outside in the cold air? Give an answer accurate to one decimal place. Please enter a numerical answer below. Accepted formats are numbers or \"e" based scientic notation eg. 0.23, -2, le6, 5.23e-8 Enter answer here Hz AA kudu.com CL 01:41 .... Kudu Support CHECK No answer ANSWER submitted 0 of 5 checks used Part b (1 points) What will be the wavelength of the sound wave in the warm concert hall? Give an answer accurate to at least 2 decimal places. 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 m CHECK No answer ANSWER submitted 0 of 5 checks used Part c (1 points) What will be the wavelength of the sound wave outside in the cold air? Give an answer accurate to at least 2 decimal points. Please enter a numerical answer helow Accented Scroll to Back Top Questions AA kudu.com C0 of 5 checks used Part d (1 pointS) Assume there is a sharp boundary between the warm air in the concert hall and the cold air outside. What happens to the sound wave at that boundary? Hint: the acoustic impedance of cold air is higher than that of hot air. Select the correct answer No answer submitted 0 of 3 checks used Some of the wave is reected and some is O transmitted. Neither the reected nor transmitted wave are inverted. The wave is fully transmitted into the cold outside air. 0 The wave is fully reected back into the concert 0 hall. Some of the wave is reected and some is AA kudu.com CL 01:41 .... Kudu ? Support CHECK No answer ANSWER submitted 0 of 3 checks used Some of the wave is reflected and some is O transmitted. Neither the reflected nor transmitted wave are inverted. O The wave is fully transmitted into the cold outside air. O The wave is fully reflected back into the concert hall. Some of the wave is reflected and some is O transmitted. The transmitted wave is inverted and the reflected wave is not. Some of the wave is reflected and some is O transmitted. Both the reflected nor transmitted wave are inverted. Some of the wave is reflected and some is O transmitted. The reflected wave is inverted and the transmitted wave is not. Scroll to Back Top Questions AA kudu.com CQuestion 14 This question contains multiple parts. Make sure to read all the instructions and answer each part. In the figure below, a device is initially configured so that a sound wave starting from the speaker on the left divides into two paths that later recombine at the receiver on the right, with no difference between their path lengths. The sound wave is a pure tone with a wavelength of 2.0 meters. Image size: s M L Max Slidingsection :t' ' ' ' 'I . l | I l I | I l I ,, , i '1 4 Receiver AA kudu.com CL Fill in the blanks in the following statements: The two paths for the sound wave start out with the same length. The sound waves from the two paths exhibit interference. If a soundabsorbing plug is placed in one of the paths, preventing sound from getting through, then the amplitude of the sound wave at the receiver will be as big as when both paths are open. Select the correct answer No answer submitted 0 of 3 checks used constructive, one quarter constructive, twice constructive, half destructive, half destructive, four times DOOOOO destructive twine AA kudu.com CL If the sliding section (on the upper path) is moved upward by 0.50 meters, (i.e., the top horizontal arm is 0.50 meter higher than the original conguration) then which of the following statements is true about the new conguration? Choose the best answer. Select the correct answer No answer submitted 0 of 3 checks used The sound heard by the receiver is 41% higher in amplitude compared to the original. 0 O The sound heard by the receiver is unchanged compared to original conguration. 0 The sound heard by the receiver is 1/2 in amplitude compared to the original. 0 The sound heard by the receiver is twice in amplitude compared to the original. The sound heard by the receiver is zero (or very nearly zero). 0 AA kudu.com CL Question 15 (1 points) Two audio speakers are placed on a vertical rail. Speaker A is placed at head-level while Speaker B is place at some variable height, Ay, above Speaker A. Both speakers receive simultaneous input from a sine wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.364 meters. Calculate the lowest height that Speaker B can be placed above Speaker A to produce a minimum of sound heard by person standing A3: = 3.79 meters directly in front of Speaker A. Hint: Write a formula for the difference in path length from the two speakers. Image size: s M L Max Please enter a numerical answer below. Accepted formats are numbers or \"e" based scientific notation e.g. 0.23, -2, le6, 5.23e-8 Enter answer here meters AA kudu.com CL