# Physics Lab

posted by .

Hello, we are doing a lab dealing with diffraction gratings. The problem I have is that we are supposed to find the number of slits, N, based on gathered information. I have x, L, d, m, and w, just not N, which is what I am trying to find. I also have the wavelength. Is this the right equation to use? dsintheta= mlambda and then reagrrange to find N, for d=(w/N) and sintheta= (x/L) so the equation for N would be to take mlambda and divide that by (x/L) which would be equal to w/n and then to find N you would divide out the w, but my answer won't work, it is way too small. Any ideas?

• Physics Lab -

check this algebra

w/N sinTheta= m lambda

N= w/(m lambda) * sinTheta

N= w/(m lambda) * x/L

• Physics Lab -

yes! It works I got an answer or 35.2 so there were approximately 35 slits! But wow, thanks soo much! This really saved me! I appreciate this!

## Similar Questions

1. ### Biology

I really need help with my science lab. I was sick when we did the lab on Thursday and Friday was a snowday so I did not get to get the observations off my peers. My teacher has allowed people one more day and I do not understand this …
2. ### Physics

When light of a certain wavelength is incident normally on a certain diffraction grating the line of order 1 is at a diffraction angle of 25 degrees. The diffraction angle of the second order line is : a) 25 b) 42 c) 50 d) 58 e) 75 …
3. ### Lab in general

I just read my syllabus for lab and I am kind of shocked at what it says. I do know that I have to write out procedures of the lab in my nbk before coming to lab but I just read that it says "You will NOT be allowed to refer to you …
4. ### Sources of error for lab

Hey! So I need help coming up with a source error for this lab I did. We rolled a car down a wooden board and timed the cart rolling down at different distances on the board. So far I have errors dealing with friction, the stopwatches, …
5. ### Lab for physics

K, so we are doing this lab in physics where a ball on a string is put through a glass tube and then different washers (masses) are added to the string. A radius is measured out, and then the string is spun in a horizontal direction...so …
6. ### une lab de physics

Hello, we are doing a lab dealing with diffraction gratings. The problem I have is that we are supposed to find the number of slits, N, based on gathered information. I have x, L, d, m, and w, just not N, which is what I am trying …
7. ### Physics Lab

I'm doing a lab on centripetal force but I'm not sure how to make the graphs. If you search for "centripetal force lab" on Google and click "I'm Feeling Lucky" it will take you to the exact lab I'm doing. I'm supposed to graph Fc vs. …
8. ### Physics

Hello, I am doing a physics experiment regarding rotational motion and equilibrium. We have the following lab setup and are supposed to find the unknown mass. How should I approach this?
9. ### chemistry

i have to write lab report based on my determination of chemical formula & in lab we did experiment & found out the formula was cucl2*2h2o, in my lab report i have to start with mole to mole ratio how can i start writing that?
10. ### Chemistry

I did a lab, an kinetics lab (iodide clock) and in my lab report I have to calculate the initial rate in mol L-1 s-1 and I'm not sure how to do that. I have the [I-] and [S2O82-] in mol L-1 already. The reagents are [KI] [NaCl] [Na2S2O3] …

More Similar Questions