Slide 1 / 66 Slide 2 / 66 1 Two sound sources S1 and S2 produce - PDF document

Slide 1 / 66 Slide 2 / 66 1 Two sound sources S1 and S2 produce waves with frequencies 2 Which of the following is a true statement about the speed of 500 Hz and 250 Hz. When we compare the speed of wave 1 to the sound in three different materials: air, water, and steel? speed of wave 2 the result is: A V air > V water > V steel A Twice as great B V air > V water = V steel B One-half as great C V air < V water > V steel C The same D V air < V water < V steel D It cannot be determined with the given information. Slide 3 / 66 Slide 4 / 66 3 A sound source S radiates a sound wave in all directions. The 4 A sound source S radiates a sound wave in all directions. The relationship between the distances is SA = AB = BC = CD. Which relationship between the distances is SA = AB = BC = CD. Which of the following points oscillates at the highest frequency? of the following points oscillates at the greatest intensity? A Point A A Point A B Point B B Point B C Point D C Point D D They all have the same frequency D They all have the same intensity Slide 5 / 66 Slide 6 / 66 5 The loudness of a sound wave increases with increasing which of 6 A sound wave travels from air into water. Which of the following the following: doesn’t change? A Frequency A Frequency B Amplitude B Amplitude C Wavelength C Wavelength D Speed of sound D Speed of sound

Slide 7 / 66 Slide 8 / 66 7 A sound wave resonates in a tube with two open ends. What are 8 The lowest frequency in an open tube is 300 Hz. What are the the wavelengths of the three lowest resonating frequencies three following frequencies will resonate in the tube? generated in the tube? A 600Hz, 900Hz, 1200Hz A L, 2L, 3L B 100Hz, 200Hz, 400Hz B 2L, L, 2L/3 C 150Hz, 450Hz, 850Hz C L/2, L/3, L/5 D 50Hz, 100Hz, 150Hz D 4L, 4L/3, 4L/5 Slide 9 / 66 Slide 10 / 66 9 The lowest frequency in an open tube is 200 Hz. Which of the 10 A sound wave resonates in an open pipe with a length of 2 m. following frequencies will resonate in the tube? What is the wavelength of the wave? A 0.5m A 50Hz B 1.0m B 100Hz C 1.5m C 250Hz D 2.0m D 400Hz Slide 11 / 66 Slide 12 / 66 11 A sound wave resonates in an open pipe with a length of 4 m. 12 A sound wave resonates in an open pipe with a length of 3 m. What is the resonating frequency? (V sound = 340 m/s) What is the wavelength of the wave? A 85Hz A 1.5m B 170Hz B 2.0m C 340Hz D 510Hz C 3.0m D 6.0m

Slide 13 / 66 Slide 14 / 66 13 A sound wave resonates in an open pipe with a length of 1.5 m. 14 A sound wave resonates in a tube with one open end. What are the What is the resonating frequency? (Vsound = 340 m/s) wavelengths of the three lowest resonating frequencies generated in the tube? A 85Hz A L, 2L, 3L B 170HZ B L, 2L, 2L/3 C 340Hz C L/2, L/3, L/5 D 510Hz D 4L, 4L/3, 4L/5 Slide 15 / 66 Slide 16 / 66 15 The lowest frequency in a closed tube is 300 Hz. What are the 16 The lowest frequency in a closed tube is 400 Hz. Which of the three following frequencies will resonate in the tube? following frequencies will resonate in the tube? A 600Hz, 900Hz, 1200Hz A 500Hz B 100Hz, 200Hz, 400Hz B 800Hz C 250Hz, 500Hz, 750Hz C 1200Hz D 900Hz, 1500Hz, 2100Hz D 2500Hz Slide 17 / 66 Slide 18 / 66 17 Two sound sources generate pure tones of 70 Hz and 80 Hz. What 18 A sound wave resonates in a closed pipe with a length of 1.5 m. is the beat frequency? What is the wavelength of the wave? A 5Hz A 1.5m B 10Hz B 2.0m C 15Hz C 2.5m D 20Hz D 3.0m

Slide 19 / 66 Slide 20 / 66 19 A sound wave resonates in a closed pipe with a length of 3.5 m. 20 A sound wave resonates in a closed pipe with a length of 2.5 m. What is the wavelength of the wave? What is the resonating frequency? (Vsound = 340 m/s) A 1.5m A 85Hz B 2.0m B 170Hz C 3.0m C 240Hz D 6.0m D 680Hz Slide 21 / 66 Slide 22 / 66 21 Two sound sources generate pure tones of 115 Hz and 130 Hz. 22 Two sound sources produce waves with slightly different What is the beat frequency? frequencies. What happens with the beat frequency if the frequency of the lowest tone increases and keeps increasing? A 5Hz A Increases B 10Hz B Decreases C 15Hz C Increases and then decreases D 20Hz D Decreases and then increases Slide 23 / 66 Slide 24 / 66 23 A sound source approaches a stationary observer at a constant 24 An airplane moves away from a stationary observer at a constant speed of 34 m/s. If the frequency of the stationary source is 90 Hz, speed of 340 m/s. The frequency of the sound wave of the what is the frequency heard by the observer? stationary airplane is 780 Hz. What is the frequency heard by the observer? (Vsound = 340 m/s) A 90Hz A 1560Hz B 100Hz B 780Hz C 180Hz C 390Hz D 270Hz D 195Hz

Slide 25 / 66 Slide 26 / 66 26 A sound source moves at a constant 25 Two loudspeakers generate sound waves with frequencies of 680 velocity V obj and generates a sound Hz. What is the extra distance traveled by the second wave if a wave. The speed of sound is V sound . stationary observer detects maximum intensity of sound at point P? Which of the following is true about the direction and magnitude of the source velocity? A 0.75m B 1.50m C 1.75m Direction Magnitude D 2.25m A To the right V obj > V sound B To the right V obj < V sound C To the right V obj = V sound D To the left V obj = V sound Slide 27 / 66 Slide 28 / 66 27 You are given a hollow tube with an adjustable length and a tuning 28 Resonance occurs in a soft drink bottle as air is blown across its fork with its frequency printed on it. What measurement would you top. What property of the resonant sound wave in the bottle need to make in order to calculate the speed of sound in that remains the same as the level of fluid in the bottle decreases? room? A The speed of the wave B The wavelength of the wave A The period of the tuning fork. C The frequency of the wave B The length of the tube at which that frequency resonates. D Nothing remains the same. C The temperature in the room. D The diameter of the tube. Slide 29 / 66 Slide 30 / 66 29 Students are listing to two tones and watching the frequencies on a 30 Students are using a speaker to gradually increase the frequency display as shown below. What can the students conclude from the heard. They have one open tube with a length of 0.5m and one display? Select two answers. closed tube of 0.75m. Which two of the following frequencies will resonate in both tubes? A 340Hz B 680Hz C 1020Hz D 1360Hz A The sound waves are traveling in the same direction. B The sound waves have different frequencies. C The sound waves have the same amplitude. D The sound waves are traveling at different speeds.