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

• 350 Hz

• 361 Hz

• 411 Hz

• 448 Hz

Answer 1

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]: 448 Hz.

Explanation:

Both source and observer are moving towards each other,

`"n" = "n"_0(("v"+ "v"_0)/("v"-"v"_s)) = 400  ((340+16.5)/(340-22))`

`"n" = 448  "Hz"`