Jump to content
Sign in to follow this  

Question about Uncertainties?

Recommended Posts

This is for a bio lab.

But anyway,

How would one calculate an uncertainty for light intensity. I am using the formula WATTS/4π(0.1)^2. Where 0.1 is the distance of the light from the object which i measured with a ruler and than converted to meters. So wouldn't my uncertainty for my ruler be +/- 0.5cm but what would my uncertainty for my WATTS light bulb be and for my light intensity in total??? I am really confused, any help will be greatly appreciated!

Share this post


Link to post
Share on other sites

I don't know what rulers you use, but don't the standard ones measure millimeters? Your uncertainty tells me that it doesn't. I'll assume you made a mistake there. Your measurement is was originally 10.00+/- 0.05cm, and now it should be 0.1000 +/-0.0005m.

I don't take biology, but your measurement for watts should be dependent on the uncertainty of your reading (how you got the value for watts). Did you use a multimeter? Or was the watt reading already given? If you can give me some information about this, I will probably be able to help you a bit more.

In general when you divide uncertainties, you add their percentage uncertainties.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...