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ent/Assignment-Responses/submit?dep=222380138tagsautosave The Bridge I Uber Health ops O ESS O Outlook Sample Scholarship Validations O EdAssist 6. 1/1 points Previous Answers SerCP11 14.3.P.004. D My Notes Ask Your Teacher A dolphin located in sea water at a temperature of 25°C emits a sound directed toward the bottom of the ocean 155 m below. How much time passes before it hears an echo? 0 202 Need Help? Read It 7. 0/2 points Previous Answers O My Notes SerCP11 14.6.P.027. O Ask Your Teacher A commuter train passes a passenger platform at a constant speed of 41.2 m/s. The train horn is sounded at its characteristic frequency of 324 Hz. (a) what overall change in frequency is detected by a person on the platform as the train moves from approaching to receding? (Indicate whether the frequency increases of decreases with the sign of your answer.) The response you submitted has the wrong sign. Hz (b) What wavelength is detected by a person on the platform as the train approaches? Did you accidentally divide or take the inverse in your calculation? m Need Help? Read it Practice Another Version Submit Answer Ask Your Teacher D My Notes SerCP11 14.6.P.030. Previous Answers 8. 2/2 points At rest, a car's horn sounds the note A (440 Hz), The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with Total Vistors Today

Answer 1

6 Velocity of Sound in water V = 1530 m/s Time ita ad 2x 155 = 0.202 See 7530 V = 41.2 m/s, f = 324 HZ obschver velocity sound When approaching the frequency heary 343 324 ta (v.) t = 343-412 343-41.2 S-368.23 HZ When recedug - 343 & 324 – 289. 26H2 343 +41.2 a change in frequency Af = 368.23-289.26 Af = 78.97 Hz com ~ 80 Hz 343 b) War length (X) = = 2 823 20.931 m 20.931 m 368.23