A source emits a sound of a frequency of 400Hz, but the listener hears it’s to be 390Hz. Then?
(a) The listener is moving towards the source
(b) The source is moving towards the listener
(c) The listener is moving away from the source
(d) The listener has a defective ear
The question was posed to me in examination.
I want to ask this question from Travelling Waves in division Waves of Engineering Physics I