I have uploaded in YouTube the video solution of IIT JEE ADVANCED 2018 PHYSICS Paper 1 Question #8. I have explained the solution in details after breaking it down to smaller parts. A must watch for all class 12 students and those preparing for NEET, IIT JEE or other such entrance exams.
This problem is on 'Doppler's Effect' in sound and 'Beats'. These topics are covered in class 11 (or H.S. 1st year) physics towards the end. So, those who have completed class 11 will find it suitable to watch.