Physics · 2019
JEE Main · 12 April 2019, Shift 1 · Q13
A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a…
A submarine (A) travelling at $\displaystyle 18$ km/hr is being chased along the line of its velocity by another submarine (B) travelling at $\displaystyle 27$ km/hr. B sends a sonar signal of $\displaystyle 500$ Hz to detect A and receives a reflected sound of frequency $\displaystyle \nu$. The value of $\displaystyle \nu$ is close to :
(Speed of sound in water $\displaystyle =1500 \mathrm{~ms}^{-1}$ )
Official answer
(1)
$\displaystyle 502$ Hz
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.