A train moving with constant speed 40 m/...

A train moving with constant speed 40 m/s in an elliptical path in anticlockwise direction, blows horn at point P. An observer standing at point 'Q' receives the horn sound of frequency 2000 Hz. If ratio of minor to major axis is `(1:sqrt 3)` and speed of sound in air is 320 m/s, then true frequency of sound will be

2000 Hz

2100 Hz

1875 Hz

1675 Hz

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