# hard wave interference problemWatch

Announcements
#1
How do you do this question?

A car moves along a road that is parallel to the twin antennas of a radio station broadcasting at a frequency of 95.0 MHz. The antennas are 30.0 m apart and the distance of A from the mid-point of the antennas is 2.0 km. When in position A, the reception is good, but it drops to almost zero at position B. Calculate the distance AB.
Last edited by hannah312; 1 week ago
0
1 week ago
#2
(Original post by hannah312)
How do you do this question?

A car moves along a road that is parallel to the twin antennas of a radio station broadcasting at a frequency of 95.0 MHz. The antennas are 30.0 m apart and the distance of A from the mid-point of the antennas is 2.0 km. When in position A, the reception is good, but it drops to almost zero at position B. Calculate the distance AB.
You just need to apply equation (37.8) in the following link.
0
1 week ago
#3
(Original post by hannah312)
How do you do this question?

A car moves along a road that is parallel to the twin antennas of a radio station broadcasting at a frequency of 95.0 MHz. The antennas are 30.0 m apart and the distance of A from the mid-point of the antennas is 2.0 km. When in position A, the reception is good, but it drops to almost zero at position B. Calculate the distance AB.
Use the Youngs double slit equation. fringe width = LambdaD/s
Lamda = c/95x10^6
D =2000
s=30

fringe width gives length of maxima to maxima then divide this by 2 since you want the length from maxima to the minima inbetween
0
#4
How do you know that D=2000 when the question doesn't say that A is perpendicular to the mid point?
(Original post by Physikoi)
Use the Youngs double slit equation. fringe width = LambdaD/s
Lamda = c/95x10^6
D =2000
s=30

fringe width gives length of maxima to maxima then divide this by 2 since you want the length from maxima to the minima inbetween
0
1 week ago
#5
it has to be perpendicular to the midpoint of car since car is moving paralell relative to signal generators. Try drawing a sketch
0
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• SOAS University of London
Wed, 29 May '19
• University of Exeter
Thu, 30 May '19
• Cranfield University
Cranfield Forensic MSc Programme Open Day Postgraduate
Fri, 31 May '19

### Poll

Join the discussion

Loved the paper - Feeling positive (209)
22.69%
The paper was reasonable (416)
45.17%
Not feeling great about that exam... (172)
18.68%
It was TERRIBLE (124)
13.46%