Exploring EM Wave Transmissions: Experiment & Wavelength

[Sixty3]

Homework Statement

a) A microwave transmitter T and receiver R are placed side by side facing two sheets of material M (aluminium) and N (hardboard). A very small signal is registered by R; what can you deduce about the experimental set up?

b) When M is moved towards N a series of maxia and minima is registered by R. Explain this and deduce the wavelength of the e-m waves emitted by T if the distance moved M between the second and seventh minimum is 70mm.

Any help with this question, also maybe if you could show how to work it out would be great !

Homework Equations

The Attempt at a Solution

 

[gabbagabbahey]

Hi Sixty3, welcome to PF!

also maybe if you could show how to work it out would be great !

Please re-read the site rules you agreed to when you signed up for your account. We do not do your homework for you. You need to make an effort, show your work/reasoning as clearly as possible, and explain where you are stuck.

As a hint to this problem, consider what happens when light strikes a good conductor (like say aluminum) at approximately normal incidence (the transmitter is facing the two sheets of material) and what happens when it strikes a (more or less linear) dielectric (like hardboard). How much is reflected/transmitted in each case?