Two engines pass each other moving in opposite directions with uniform speed of 30 m/s. One of them is blowing a whistle of frequency 540 Hz. Calculate the frequency heard by driver of second engine before they pass each other. Speed of sound is 330 m/sec :
450 Hz
540 Hz
648 Hz
270 Hz
As we learnt in
Frequency of sound when source and observer are moving towards each other -
- wherein
Speed of sound
Speed of observer
speed of source
Original frequency
apparent frequency
Correct option is 3.
Option 1)
450 Hz
This is an incorrect option.
Option 2)
540 Hz
This is an incorrect option.
Option 3)
648 Hz
This is the correct option.
Option 4)
270 Hz
This is an incorrect option.
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