OnlineCBT
Physics · PYQ NEET UG 2017
हिन्दीTwo cars moving in opposite directions approach each other with speed of \( 22\text{ m/s} \) and \( 16.5\text{ m/s} \) respectively. The driver of the first car blows a horn having a frequency \( 400\text{ Hz} \). The frequency heard by the driver of the second car is (velocity of sound \( 340\text{ m/s} \))
Correct answer · Option 4
\( 448\text{ Hz} \)
Explanation
Using Doppler effect formula: \( f' = f (\frac{v + v_o}{v - v_s}) = 400 (\frac{340 + 16.5}{340 - 22}) = 400 (\frac{356.5}{318}
ight) \approx 448\text{ Hz} \).
