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## Homework Statement

A bat is pursuing an insect, and using echolocation of 41 kHz sound waves to track the insect. The insect is initially 34 cm from the bat but then moves to a distance of 44 cm as it tries to escape. What is the difference in the two echo times that the bat measures?

## Homework Equations

I'm not sure... is this a doppler shift question? the book has a few sentences about bats using reflection time and doppler effect to judge distances of objects.

This is an equation for radar: Ltot=vΔt

λ=v/f

Doppler shift (moving away from observer)

Fobs=(fsource)/{1+(Vsource/Vsound)}

## The Attempt at a Solution

I attempted to find time by using the Ltot=vΔt equation. 2(.34)=343t -> t=.0019s

2(.44)=343t -> t=.0026s. Obviously wrong. Don't know where to start. Please help.