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
65 views
in Physics by (90.2k points)
closed by
An operator sitting in his base camp sends a sound signal of frequency 400 Hz. The signal is reflected back from a car moving towards him The frequency of the reflected sound is found to be 410 Hz. Find the speed of the car. Speed of sound in air` = 324 m s^-1`.

1 Answer

0 votes
by (85.5k points)
selected by
 
Best answer
Correct Answer - A::D
Let the speed of the car =xm/sec
So, frequency heard at car n
`v=(v+v_(car))/vxxn_0=(324+x)/324xx400`
and frequency heard by operator for reflected sound wave
`n_1=324/(324-x)xxn`
`rarr 410=324/(324-x)xx(324+x)/324xx400`
`rarr 324(410-400)=810xrarrx=4m/sec`

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

...