How Does Changing Distance Affect Microwave Path Difference?

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Homework Help Overview

The discussion revolves around the effects of changing distance on the path difference in a microwave context, particularly in relation to interference patterns and phase differences. Participants are exploring concepts related to wave interference and the Doppler effect.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand how varying the distance from the source affects path difference and phase difference. Questions are raised about the definitions of minima in interference patterns and the conditions for achieving zero amplitude. Other participants discuss the implications of partial reflection and the Doppler effect in relation to the problem.

Discussion Status

The discussion is ongoing, with participants providing insights and clarifications regarding the nature of wave interference and the Doppler effect. Some guidance has been offered, suggesting that participants explore the concept of 'Doppler radar' to further their understanding of the problem.

Contextual Notes

There appears to be some confusion regarding the type of waves being discussed, as participants interchangeably refer to sound waves and microwaves. Additionally, the original poster expresses uncertainty about the implications of path differences and amplitude in the context of interference.

heroslayer99
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Homework Statement
Show that the student is correct.
Relevant Equations
x
1706953420488.png

I understand the equation (path difference)/wavelength x 2pi = phase difference, but in this case I do not know how changing the distance of H from the source will affect the path difference. In addition to this, does minima refer to 0 amplitude (complete destructive interference) or does minima just refer to less than maxima? Does a path difference of lambda/2 gurantee the resulting signal has 0 amplitude?
 
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Hi,

Zero amplitude can only be achieved when equal amplitude waves interfere. Here, all you are given is that H is a partial reflector.

##\ ##
 
BvU said:
Hi,

Zero amplitude can only be achieved when equal amplitude waves interfere. Here, all you are given is that H is a partial reflector.

##\ ##
Ok thanks. Any tips on how to do the question
 
heroslayer99 said:
Ok thanks. Any tips on how to do the question
What should be the received frequency of the reflections from the moving plate?
 
I dont know, 200hz?
 
heroslayer99 said:
I dont know, 200hz?
Have you never learnt about the Doppler effect with sound waves?
 
No, also aren't these microwaves
 
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heroslayer99 said:
No, also aren't these microwaves
You are missing the point!

Tip: find out what 'Doppler radar' is and how it works. Then see if you can apply your new found knowledge to this problem Then ask us to check/advise.
 

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