A source of sound emitting a frequency of 200Hz is dropped from a height. During its fall under gravity it crosses a balloon moving with a constant velocity of 2m/s (upwards), one second after it started to fall. The observer in the balloon hears 12 beats at the moment the source crosses the balloon. Velocity of sound in air at 0°C is 320m/s. This phenomena can be observed at poles or at equator?
[Take g = 10m/s2 to be uniform on earth’s surface]