NEET Solved Paper 2017 Question 39
Question: Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s]
Options:
A) 448 Hz
B) 350 Hz
C) 361 Hz
D) 411 Hz
Show Answer
Answer:
Correct Answer: A
Solution:
- $ f _{A}=f[ \frac{v+v _0}{v-v _{s}} ] $ $ =400[ \frac{340+16.5}{340-22} ] $ $ f _{A}=448Hz $
