- #1

mrdman

- 3

- 1

- Homework Statement
- If the power at 100m is 5W, using inverse 2.5 power law, find the power at 400m.

- Relevant Equations
- 1 / d ^ x

Hi everyone! Awesome forum!

I'm doubting myself on a problem about inverse square law.

I'll change the actual values from my homework problem as I want to check that I have the right idea rather than the specific numeric answer.

If I am using an inverse 2.5 power law and know the power at 100m is 5W.. If I want to find out the power at 400m, is the following correct...?

100m: 5W

200m: 5 * 1/2 ^ 2.5

300m: 5 * 1/3 ^ 2.5

400m: 5 * 1/4 ^ 2.5

So the answer will be: 5 * (0.25)^2.5

Which is 5 * 0.03125 = 0.15625W

I've had three attempts so far and keep getting varying answers each time!

I'm doubting myself on a problem about inverse square law.

I'll change the actual values from my homework problem as I want to check that I have the right idea rather than the specific numeric answer.

If I am using an inverse 2.5 power law and know the power at 100m is 5W.. If I want to find out the power at 400m, is the following correct...?

100m: 5W

200m: 5 * 1/2 ^ 2.5

300m: 5 * 1/3 ^ 2.5

400m: 5 * 1/4 ^ 2.5

So the answer will be: 5 * (0.25)^2.5

Which is 5 * 0.03125 = 0.15625W

I've had three attempts so far and keep getting varying answers each time!