Interference pattern (easy?)

  • #1
guest948
4
0
Homework Statement:
A student directs a beam of microwaves ... (Please refer to the attachment.)
Relevant Equations:
/
I guess C: constructive interference pattern along the central line.

Am I correct?
 

Attachments

  • help!.png
    help!.png
    43.7 KB · Views: 78

Answers and Replies

  • #2
DaveE
Science Advisor
Gold Member
2,841
2,488
C: constructive interference pattern along the central line.
If the two paths (through each slit) add constructively, as you guessed, then why would the intensity measured increase and decrease with distance as shown in drawing C?

What do you know about the two path lengths from the source to the detector? What does that mean for the phase relationship between them?
 
  • #3
guest948
4
0
then why would the intensity measured increase and decrease with distance as shown in drawing C?
The path lengths are the same, so they are in phase and they add constructively along PQ.
So the answer is C (or A)?
 
  • #4
DaveE
Science Advisor
Gold Member
2,841
2,488
The path lengths are the same, so they are in phase and they add constructively along PQ.
So the answer is C (or A)?
The detector can't respond fast enough to measure the instantaneous energy in the radio wave, it only measures the time averaged intensity of the radiation. So why then would the intensity increase and decrease as the detector is moved away from the slits?
 

Suggested for: Interference pattern (easy?)

Replies
1
Views
320
Replies
5
Views
339
  • Last Post
Replies
6
Views
355
Replies
2
Views
423
  • Last Post
Replies
5
Views
276
Replies
4
Views
328
Replies
2
Views
327
Replies
4
Views
456
Replies
5
Views
434
  • Last Post
Replies
3
Views
1K
Top