Physics

A receiving antenna becomes misaligned by 30° to its original position. The power of the received signal in this new position is 12µW.
Wavelength = 0.016 m
I calculated the power received in the original position as 1.04 x 10^-5 W

What I need to find out next is the minimum time between the wave leaving the transmitting antenna and its reception.

Thanks

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  1. Never mind, I figured out how to do it and got 1.2 x 10^-18 s

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  2. can you post the process?

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  3. I had this question bookmarked and happened to come back.

    c = fλ
    3 x 10^8 = f(0.016)
    f = 18,750,000,000 Hz

    E = hf
    E = (6.63 x 10^-34)(18,750,000,000)
    E = 1.24 x 10^-23 J

    P = E/t
    1.04 x 10^-5 = (1.24 x 10^-23)/t
    t = 1.2 x 10^-18 s

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  4. Apparently my teacher was wrong?? I finally looked at the markscheme while studying for the mocks and it's TOTALLY different. And a lot simpler.

    Use:
    I = Initial I(cosθ)^2
    Arrange that into:
    Initial I = I/(cosθ)^2

    (12 µ)/(cos30)^2
    1.6 x 10 ^-5 W

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  5. The time should be 1.9 x 10^-4 s using that new power.

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  6. How did you get the time using that power though?

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  7. where is that equation coming from I've never seen it: I = Initial I(cosθ)^2
    also assuming its true putting it into a calculator with those values does not give you 1.6 x 10 ^-5 W i am so confused

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  8. The time taken is speed of light/ distance. In the figure the distance is given to be 56 km (56 x 10^3 m) and the speed of light is 3 x 10^8 ms^-1, so the time taken is ≈ 1.9 x 10^-4 seconds.

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  9. you can see that it is a one mark question do don't over think it.

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