hello
I amm trying to understand the difference between flux and specific intensity of radiation.
I understand that one is dependent on distance the other is not, but
can you make it more tangible with an example?
well, maby it is not a proof, but this in not what i am looking for. I am just trying to understand the thought, the logic, behind what may , or may not be a proof. the insight is interesting
the foolowing are 2 other links that say the same thing .
http://www.einstein-online.info/spotlights/cosmic_sound/?searchterm=angular%20size
i don't understand why it is a proof and i don't understand why it is not a proof either
thank you for your reply mathman
when we measure the apparent size of temperature fluctuations, in order to determine the curvature of the universe, is the measurement local or global ?
hello
I have a question:
i am trying to understand how we find out that the curvature of the universe is zero using the angular size of the hot spots of the d microwave background radiation.
http://scienceblogs.com/startswithab...tire-universe/
there is a picture in this blog showing the...
hello
I have a question:
i am trying to understand how we find out that the curvature of the universe is zero using the angular size of the hot spots of the d microwave background radiation.
http://scienceblogs.com/startswithabang/2012/07/18/how-big-is-the-entire-universe/
there is a...
i know the thread is old but i have a question
what shall we take as a length to calculate E, the length πr of the arc or the length 2r of the line segment and why?
thanks a lot
hello every body. I have a high school problem
a straight horizontal wire is falling freely in a homogeneous horizontal magnetic field, perpendicular to the wire and i want to find the inductive voltage.
I said E= Blv=Blgt
But I can also say E=ΔΦ/Δt=BΔΑ/Δt=Βl1/2gt [t][2]/Δt=1/2Blgt
why...