Can Relative Velocity Determine Bat's Speed Without Doppler Effect?

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Homework Help Overview

The discussion revolves around a problem involving the speed of a bat that emits sound and another bat that hears the sound at a different frequency. The original poster is exploring the possibility of determining the speed of the second bat without relying on the Doppler effect.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to use basic physics formulas, such as frequency and time relationships, to find the bat's speed. Some participants question whether the Doppler effect equations are necessary or if relative velocity can be applied instead.

Discussion Status

Some participants have noted that they have successfully solved the problem using the Doppler effect, while others are exploring alternative methods involving relative velocity. There is an ongoing examination of the assumptions and relevance of different approaches.

Contextual Notes

The original poster expresses uncertainty about the relevance of their initial attempts and the constraints of not using the Doppler effect. There is a focus on understanding the problem without fully resolving it.

mikhailpavel
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Homework Statement



I was thinking about the problem. There is a bat which is at rest and sends a sound of frequncy of 450 khz. another bat flying towards it hears it as a sound of frequency of 457 hz. i was trying to know the velocity of the second bat using simple physics formula or without using doppler's effect or other phenomena.

Homework Equations


i tried to do this by using t= 1/f but to say the truth didnt go any farther. and i don't have any idea about the relevancy. may the v=lambda *frequency and t=1/f will help.

The Attempt at a Solution

 
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Did you look at the equations for the Doppler effect.
 
Ya i have solved using doppler effect. i was thinking if it can be used using relative velocity phenomena.
 
mikhailpavel said:
Ya i have solved using doppler effect. i was thinking if it can be used using relative velocity phenomena.

Have you looked at the derivation of the Doppler formula?
 

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