When walking,Lisa,an eighteen year-old who is blind,has learned to attend to the subtle changes in pitch of echoes from objects as she moves towards them.Which phenomenon is responsible for these changes?
A)obstacle sense
B)Doppler effect
C)echolalia
D)tactual perception

Question

Quizplus · Accepted Answer

The Doppler effect is responsible for the changes in pitch of echoes. As Lisa walks towards objects, the sound waves bounce off the objects and return to her. Due to the Doppler effect, the pitch of the returning echoes changes as Lisa moves towards the objects, allowing her to attend to the changes in pitch to navigate her surroundings.

When Walking,Lisa,an Eighteen Year-Old Who Is Blind,has Learned to Attend