JEE Advanced · Physics · 16. Waves & Sound
Two loudspeakers M and N are located 20m apart and emit sound at frequencies 118 Hz and 121 Hz, respectively. A car is initially at a point P, 1800 m away from the midpoint Q of the line MN and moves towards Q constantly at 60 km/hr along the perpendicular bisector of MN. It crosses Q and eventually reaches a point R, 1800 m away from Q. Let represent the beat frequency measured by a person sitting in the car at time t. Let be the beat frequencies measured at locations P, Q and R, respectively. The speed of sound in air is Which of the following statement(s) is(are) true regarding the sound heard by the person ?
- A The plot below represents schematically the variation of beat frequency with time
- B The plot below represents schematically the variations of beat frequency with time
- C The rate of change in beat frequency is maximum when the car passes through Q
- D
Answer & Solution
Correct Answer
(A) The plot below represents schematically the variation of beat frequency with time
Step-by-step Solution
Detailed explanation
and is maximum when
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