Respuesta :
Answer:
b.IT is perceived to be fluctuating
Explanation:
we can determine it with an exmple like when an aeroplane passed from above our head we first hear a low pitch ,secondly the pitch greater and at last the pitch becomes lower
Answer:
b.IT is perceived to be fluctuating
Explanation:
we can determine it with an exmple like when an aeroplane passed from above our head we first hear a low pitch ,secondly the pitch greater and at last the pitch becomes lower