Frequency of TV signal from EM waves

[Bolter]

Homework Statement

See image attached below

Relevant Equations

V = freq x wavelength

Having some trouble with this question

I believe phenomenon behind this one is that the student is passing between nodes (minimum displacement) to antinodes (maximum displacement) which explains why the signal weakens and strengthens continuously. Hence the ans to this is option C?

For the 2nd part, I have this:

From what I have figured out earlier, I had done the following:

Does this seem reasonable?

Thanks for any help!

 

[scottdave]

It looks like you know what you're doing. Check out this EngineerGuy video where he does a similar type experiment with a microwave oven and some melting cheese (about 2 minutes into the video).

 

[Bolter]

It looks like you know what you're doing. Check out this EngineerGuy video where he does a similar type experiment with a microwave oven and some melting cheese (about 2 minutes into the video).

Thank you for sharing this video, found it pretty fascinating