Two radio antennas A and B radiate in phase. Antenna B is a distance of 120 m to the right of antenna A. Consider point Q along the extensio

Question

Two radio antennas A and B radiate in phase. Antenna B is a distance of 120 m to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 40.0 m to the right of antenna B. The frequency, and hence the wavelength, of the emitted waves can be varied. What is the longest wavelength for which there will be destructive interference at point Q?

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Diễm Thu 3 years 2021-08-21T06:57:33+00:00 1 Answers 196 views 0

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  1. thienthi
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    2021-08-21T06:59:08+00:00
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    Answer:

    240 m

    120 m

    Explanation:

    d = Path difference = 120 m

    For destructive interference

    Path difference

    d=\dfrac{\lambda}{2}\\\Rightarrow \lambda=2d\\\Rightarrow \lambda=2\times 120\\\Rightarrow \lambda=240\ m

    The longest wavelength is 240 m

    For constructive interference

    d=\lambda\\\Rightarrow 120\ m=\lambda

    The longest wavelength is 120 m

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