Two submarines are underwater and approaching each other head-on.Sub A has a spe
ID: 1756211 • Letter: T
Question
Two submarines are underwater and approaching each other head-on.Sub A has a speed of 13 m/s and sub B hasa speed of 13 m/s. Sub A sends out a1770-Hz sonar wave that travels at a speedof 1522 m/s. (a) What is the frequency detected by sub B (tothe nearest Hz)?1 Hz
(b) Part of the sonar wave is reflected from B and returns to A.What frequency does A detect for this reflected wave (to thenearest Hz)?
2 Hz
(a) What is the frequency detected by sub B (tothe nearest Hz)?
1 Hz
(b) Part of the sonar wave is reflected from B and returns to A.What frequency does A detect for this reflected wave (to thenearest Hz)?
2 Hz
Explanation / Answer
(a) What is the frequency detected by sub B (tothe nearest Hz)?1 Hz
apparentfrequency=(V+Vo)n/(V-Vs)=(1522+13)*1770/(1522-12)=1799.30Hz
(b) Part of the sonar wave is reflected from B and returns to A.What frequency does A detect for this reflected wave (to thenearest Hz)?
2 Hz
in this case also similar is the situation .hence frequencydetected by A is also equal to 1799.30Hz
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