can sense her from a distance
when she moves towards me
till it reaches a crescendo
when she is closest as close could be!
but those times her I badly need
when she moves away
her sounds faint as she recedes
can't all the time with me stay!
how she gives my spirits a lift
her closeness makes my day
do feel pang when she shifts
when she has to go away!
the nearer she is she delights
she must be my perfect mate
I can feel it days and nights
what you call Doppler Effect!
Christian Doppler, famous Austrian Physicist (1803-1853)
The Doppler effect is observed whenever the source of waves is moving with respect to an observer. The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.
http://www.physicsclassroom.com/class/waves/lesson-3/The-doppler-effect