• Support PF! Buy your school textbooks, materials and every day products Here!

Two Antennas

  • #1

Homework Statement


Two antennas located at points A and B are broadcasting radio waves of frequency 99.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d= 12.40 m. An observer, P, is located on the x axis, a distance x= 58.0 m from antenna A, so that APB forms a right triangle with PB as hypotenuse. What is the phase difference between the waves arriving at P from antennas A and B? Now observer P walks along the x axis toward antenna A. What is P's distance from A when he first observes fully destructive interference between the two waves? If observer P continues walking until he reaches antenna A, at how many places along the x axis (including the place you found in the previous problem) will he detect minima in the radio signal, due to destructive interference?


Homework Equations





The Attempt at a Solution


I got part A, which is 2.718 rad

http://lon-capa.bd.psu.edu/res/msu/physicslib/msuphysicslib/75_Interf_Diffrac1/graphics/prob08a_antennas.gif
 
Last edited by a moderator:

Answers and Replies

  • #2
berkeman
Mentor
56,670
6,564

Homework Statement


Two antennas located at points A and B are broadcasting radio waves of frequency 99.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d= 12.40 m. An observer, P, is located on the x axis, a distance x= 58.0 m from antenna A, so that APB forms a right triangle with PB as hypotenuse. What is the phase difference between the waves arriving at P from antennas A and B? Now observer P walks along the x axis toward antenna A. What is P's distance from A when he first observes fully destructive interference between the two waves? If observer P continues walking until he reaches antenna A, at how many places along the x axis (including the place you found in the previous problem) will he detect minima in the radio signal, due to destructive interference?


Homework Equations





The Attempt at a Solution


I got part A, which is 2.718 rad

http://lon-capa.bd.psu.edu/res/msu/physicslib/msuphysicslib/75_Interf_Diffrac1/graphics/prob08a_antennas.gif
I'm not able to see the image. Can you upload it as an attachment?
 

Related Threads for: Two Antennas

Replies
0
Views
5K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
0
Views
990
  • Last Post
Replies
1
Views
982
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
0
Views
1K
Replies
15
Views
1K
Replies
1
Views
625
Top