Question 4 Not complete Points out of 1.00 The angle between the velocity of the

Question

Question 4 Not complete Points out of 1.00 The angle between the velocity of the speed of sound in the medium and the velocity of the object in that medium is defined as alpha a. If an airplane is traveling in air with a velocity of 453.64 mph what is the angle ? Note: the velocity of sound in air is 343 mph. Flag question Select one: O a. None of these are correct. o b. 98.24 deg O c. 0.86 deg O d. 0.86 x 10E2 rads O e. 49.12 deg Check Question 5 Not complete Points out of 1.00 Flag question As shown in the figure above is a simple Helmholtz instrument. What would happen to its frequency of sound if one increases the volume V,? Select one: O a. The frequency would stay the same O b. None of these are correct. c-The frequency would decrease O d. The frequency would go up to as much as 5 times the original e. The frequency would increase. Check

Explanation / Answer

formula for match angle is

sin theta = v/ vs

theta = sin^-1 ( v/ vs)

= sin^-1 ( 343/453.64)

=49.12 degree

(b)

frequency of helmholz instrument is

f= c/ 2pi * sqrt r/V

frequency is inversily proportional to the squre root of volume

since volume increses the frequency would decreases .

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