Yahoo Answers: Answers and Comments for Radio WPHY? [Physics]
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From Bell
enUS
Fri, 22 Nov 2019 01:00:54 +0000
3
Yahoo Answers: Answers and Comments for Radio WPHY? [Physics]
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https://answers.yahoo.com/question/index?qid=20191122010054AAcSH1d
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From Diego: λf = c
λ = c/f = 3e9/760e3 = 3947 m
strengt...
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Fri, 22 Nov 2019 01:32:07 +0000
λf = c
λ = c/f = 3e9/760e3 = 3947 m
strength goes down as the square of the distance, so 16
intensity is a complicated topic. My guess is you want watts per square meter.
45 kW, 31 km,

From Jim Moor: The wavelength λ of a sinusoidal waveform trav...
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Fri, 22 Nov 2019 01:23:24 +0000
The wavelength λ of a sinusoidal waveform traveling at constant speed v is given by
v = λf
In this case, v is 'c', so we'll solve for Length
λ = c/f = 300,000m/s /(760,000cyles/s)
λ = 0.395m or 395cm

From Zirp: The wavelength would be 395 meter, not 3947
W...
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Fri, 22 Nov 2019 20:23:27 +0000
The wavelength would be 395 meter, not 3947
We're talking mediumwave, not very long wave

From billrussell42: λf = c
λ = c/f = 3e9/760e3 = 3947 m
strength ...
https://answers.yahoo.com/question/index?qid=20191122010054AAcSH1d
https://answers.yahoo.com/question/index?qid=20191122010054AAcSH1d
Fri, 22 Nov 2019 01:23:24 +0000
λf = c
λ = c/f = 3e9/760e3 = 3947 m
strength goes down as the square of the distance, so 16
intensity is a complicated topic. My guess is you want watts per square meter.
45 kW, 31 km,
a sphere with radius of 31000 m has a surface area of 4πr² = 4π31000² = 1.21e10 m²
so watts/m² = 45000/1.21e10 = 3.73e6 or 3.73 µW/m²
"The resonance frequency does not depend on the inductance" FALSE
"You tune to a higher frequency by increasing C" FALSE
"The resonance frequency does not depend on the resistance" TRUE
"The higher the resistance, the higher the resonance frequency" FALSE
If the inductance L is 1.1 mH and the resistance R is 20 Ω,
f = 1/(2π√(LC)) = 760000
2π√(LC) = 1/760000
LC = (1/1530000π)²
C = (1/0.0011) (1/1530000π)² = 3.9e11 F or 39 pF