Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
8.3k views
in Physics by (51.1k points)

A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If V = the velocity of sound, the velocity of the car is 

(a) V/

(b) V/2 

(c) V/3 

(d) V/4

Please log in or register to answer this question.

1 Answer

0 votes
by (50.3k points)

Correct Answer is: (c) V/3 

Let u = speed of the car, ns = frequency of the horn.

Frequency received, and reflected, by the cliff = n1 = ns/1 - u/V.

Frequency observed by the driver = n2 = n1(1 + u/V) = 2ns

or ns(1 + u/V) / 1 - u/V = 2ns

or u = V/3.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...