Under the Doppler effect if a wave source is moving away from you then the frequency of the wave will appear to be

whichever one it is, it's definitely not one that you included on the list you provided.

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles