hard wave interference problem Watch

hannah312
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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.
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Eimmanuel
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(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.
https://books.google.co.uk/books?id=...page&q&f=false
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Physikoi
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(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
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hannah312
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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
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Physikoi
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it has to be perpendicular to the midpoint of car since car is moving paralell relative to signal generators. Try drawing a sketch
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