Please answer the following 3 questions in the picture. Thank you /0Liz Gillies

Question

Please answer the following 3 questions in the picture.

Thank you

/0Liz Gillies Left Her New #xVw Assignment 13-Chapter x -> C D wwwwwebassign.net/web/Student/Ass ignment-Responses/last?dep= 13202898 (c) speed m/s Need Help? Read It Need Help? Read it 2. +-/1 points HawkPSE1 15.P.026 My Notes Ask Your Teacher 145 m and is open at both ends. What is the lowest frequency of a standing wave that can be found in such a column? Take the air temperature to be 20°C ) An air column has a length of Hz Need Help? ReadIt 3. +-/1 points HawkPSE1 15.P.029 My NotesAsk Your Teacher Two violins produce frequencies of 309 Hz and 312 Hz. What beat frequency is heard? Hz Need Help? Read it 4. +-/1 points HawkPSE1 15.P.030 My Notes Ask Your Teacher Two point sources are in phase and emit a 452 Hz tone. What is the phase difference at a point that is 3.0 m from one source and 7.0 m from the other? (Take the air temperature to be 20°c.) rad Need Help? ReadIt 5.+-/1 points HawkPSE1 15.P.037 My NotesAsk Your Teacher Some bats use the Doppler shift to detect the direction of motion of prey. The bats use a frequency of about 57 kHz and can detect shifts as small as 20 Hz. To what velocity does this correspond? (Take the air temperature to be 20°C. Assuming the velocities of the bat and prey to be equal, find the velocity of the prey.)

Explanation / Answer

2)

l = 0.145 m

fundamental frequency f = v/2l

f = 343/(2*0.145)

f = 1182.75 Hz

3)

Beat frequency

f = 312-309

f = 3 Hz

4)

Here f = 452 Hz

wavelength lambda = v/f = 343/452

lambda = 0.76 m

path difference = 7 - 3 = 4 m

phase difference = 2pi/lambda * path difference

phi = 2pi/0.76 * 4

phi = 33.05

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