proportion maths
2009-02-10 11:03 pm
Consider the inverse square law of signal attenuation in wireless transmissions Pr∝Ps/d2, where Ps is the sending power and Pr is the receiving power. Assume a receiver can receive a power of 10W when it is 10 meters away from the sender. What will be the receiving power if the receiver is 100 meters away from the sender?
回答 (1)
2009-02-10 11:07 pm
✔ 最佳答案
Pr∝Ps/d^2So we can let Pr=C(Ps)/d^2 where C is a constant
Then 10=C(Ps)/(10)^2
So C(Ps)=1000
The receiving power if the receiver is 100 meters away from the sender
=C(Ps)/d^2
=1000/(100)^2
=0.1 W
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