- #1
bobie
Gold Member
- 720
- 2
Hi,
what is the lowest visible frequency? can anyone see light with f less than 4*1014 Hz?
what is the lowest visible frequency? can anyone see light with f less than 4*1014 Hz?
Thanks, just out of interest, actually the bolded part is what interested me most. I must learn to "canvass", I regret I did not know thatThis is a very commonly asked question - did you try canvassing the answers?
The longest wavelength most people have a chance of seeing is 780nm ... with differences between individuals.
What do you want to know for?
Is there really a chance I could do that?, I'd love toThat wavelength is incredibly difficult to see - try it.
I am only a student and probably do not belong here.Googling your question is a good tool
Read lots of replies.
780nm diodes are not inexpensive ... take care though.Is there really a chance I could do that?, I'd love to
Nonsense. This site exists to help students struggling with this sort of material.I am only a student and probably do not belong here.
That is why you look at lots of answers - yu soon learn which sites are reliable.I tried googling but it is dangerous for me as I cannot distinguish good sites from bad :
I found a site on QM that explained things very clearly, I asked in a (probably my first) thread if it was reliable (how could I know?) : the thread was deleted and I was reprimanded as the answer, apparently, was "no"
hyperphysics is an educational site so it gives the standard limits ... more detailed information usually requires more detailed background knowledge.In this case I tried at a good site a mentor recommended:
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
and it gives ( like wiki and other sites) a figure of 700 nm, which I suspected to be a rounded figure. You confirmed that, but I could not possibly expect such a different figure of 790 , the one you gave me
Variation between individuals can be dramatic - with some people unable to see any red light at all.And then, I was curious to know if that can vary a lot with individuals.