Balmer series experiment

[MatinSAR]

Homework Statement

Canculate $\lambda$ using information you have.

Relevant Equations

$n\lambda=d\sin\theta$

Hello. In data that the professor sent, I see only $n$ and $\theta$. So I do not know what is d. Can I find $\lambda$ without it?

On other thing he mentioned :
Suppose that the diffraction grating consists of 300 lines per millimeter.

I know that d is the distance between two consecutive diffraction grating lines, but I don't know if it has anything to do with what my teacher said.

Can I say that for one line that passes through the diffraction grating d is 1/300 mm ?

 

[nasu]

Sure you can. This is why he gave you this information.

 

[MatinSAR]

Sure you can. This is why he gave you this information.

@nasu Thank you.