Q. The line of a sight of a jet plane makes an angle of $60^{0}$ with the vertical, and the sound appears to be coming from over the head of the observer. The speed of jet plane is (taking speed of sound waves to be v)
A) $v$
B) $v/\sqrt{3}$
C) $v\sqrt{3}$
D) $2v$
Explanation
(c) Proceeding as in above question,
$\tan{\theta = \tan{60{^\circ} = \frac{v_{p}}{v}}}$
$\therefore v_{p} = v \times \tan{60{^\circ} = v\sqrt{3}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.