Question Part Points Submissions Used 1 2 2 /2 0 /2 1/3 2/3 Total 2 /4 Two subma

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Question Part Points Submissions Used 1 2 2/2 0/2 1/3 2/3 Total 2/4 Two submarines are underwater and approaching each other head-on. Sub A has a speed of 16 m/s and sub B has a speed of 7 m/s. Sub A sends out a 1630 Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency of the sound detected by sub B?
1Hz (b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?
2 Hz Question Part Points Submissions Used 1 2 2/2 0/2 1/3 2/3 Total 2/4 Two submarines are underwater and approaching each other head-on. Sub A has a speed of 16 m/s and sub B has a speed of 7 m/s. Sub A sends out a 1630 Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency of the sound detected by sub B?
1Hz (b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?
2 Hz Question Part Points Submissions Used 1 2 2/2 0/2 1/3 2/3 Total 2/4 Question Part Points Submissions Used 1 2 2/2 0/2 1/3 2/3 Total 2/4 Two submarines are underwater and approaching each other head-on. Sub A has a speed of 16 m/s and sub B has a speed of 7 m/s. Sub A sends out a 1630 Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency of the sound detected by sub B?
1Hz (b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?
2 Hz Two submarines are underwater and approaching each other head-on. Sub A has a speed of 16 m/s and sub B has a speed of 7 m/s. Sub A sends out a 1630 Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency of the sound detected by sub B?
1Hz (b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?
2 Hz Question Part Points Submissions Used

Explanation / Answer

If the observer and source are approaching each other the frequency heard by the observer (f') is
f'=f(v+vo)/(v-vs)

where v=speed of wave

vo=speed of observer
vs=speed of source
f=frequency at source
f'=frequency observed by observer.

a)f=1630(1522+7)/(1522-16)

therefore, f= 1654.89 Hz

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