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3 years ago

11

Your friend Nader is standing 400,000 meters away. If you send a message to him using radio waves, how long will it take for him

to receive it? Round to four decimal places.

1 answer:

Citrus2011 [14]3 years ago

8 0

Speed of a radio wave in vacuum/air is 3x10^8 m/s. so, if speed is also distance/time, then time = distance/speed = 400,000/300,000,000 = ????

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gavmur [86]

For both cases we will use the proportional values of the distance referring to the amplitude and intensity. Theoretically we know that the intensity is inversely proportional to the square of the distance, while the amplitude is inversely proportional to the distance, therefore,

PART A ) Intensity is inversely proportional to the square of the distance

$Intensity \propto \frac{1}{distance^2}$

Therefore the intensity of the two values would be

$\frac{I_{27}}{I_{13}} = \frac{(13km)^2}{(27km)^2}$

$\mathbf{\therefore \frac{I_{27}}{I_{13}} = 0.232 }$

PART B) Amplitude is inversely proportional to the distance

$Amplitude \propto \frac{1}{distance}$

$\frac{A_{27}}{A_{13}}= \frac{(13km)}{(27km)}$

$\mathbf{\therefore\frac{A_{27}}{A_{13}}= 0.4815}$

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3 years ago

Need help ASAP ????????

zloy xaker [14]

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3 years ago

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3 years ago

Need help as fast as possible please<br> Thank you!

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