- #1

Ashley1nOnly

- 132

- 3

## Homework Statement

It's in attachment

## Homework Equations

E=hf. Where h= planks constant and f= frequency

## The Attempt at a Solution

I know that the flux of a photon is (# of photons)/(sec m^2)

I don't know the number of photos but I do know the frequency and power.

E=(6.6261*10^(-34)) J•s * (100 MHz)=6.621*10^-32

Also

Wavelength*frequnecy=c

I know that it's traveling 4 light years away.

Wavelength*(100MHz)=4c

Wavelength=4c/(100MHz

What equation am I supposed to use and how do I find the number of photon and how big in diameter would the recover/detector have to be. I don't want the answer just help understanding the problem and what I'm doing wrong. Or am I on the right track

Thanks in advance

#### Attachments

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