scilearner

Then how does light create an electric field? I read about induction and I can't understand how to relate it to this. Thanks

Ok I'm reading it right now. I have just have few questions though. 1. Is light the disturbance of an already existing electric field? 2. If change of magnetic flux induces electric field, how do you know which one came first? 3. How does a photon create a change of magnetic flux?

I don't understand. Isn't electric field created between two opposing charges? How is it created otherwise? Thanks

Thanks for the response However what is this electric field created between? Which charges? Why does it change?

Thanks again for your time in helping me with my questions Ok as you said I can understand how photons are released from the sun, now if they are travelling why is their an electric field created? What is the electric field created between? Electrons in the sun and protons in earth? Thanks

Hello everyone, I'm not studying about light so this question is just for interest. I know light is an electromagnetic wave. So this is my understanding of light. If there is a positive and negative charge, an electric field is created between them. If the charges oscillate this electric field oscillate and you get light if the wavelength is right. I don't know if this is wrong. My questions are 1. If electrons in the sun oscillate and produce light, what is the electric field in this situation? Between the electrons of the sun and the protons of the earth? Can't it interact with so many charges on its journey. 2. If photons are released with light do they travel from A to B or like sound does the wave propagate? I'm not studying this area, so I only have you guys to ask. Thanks

Hello guys, Ok I know surfactant has a polar and non polar group and then go to the surface and break the bonds. My question is the surfactant would still arrange itself like this picture, meaning surfactant and surfactant would have strong bonds at the surface. So how does this reduce surface tension, is surfactant surfactant bond less strong than eg water water bond here? Thanks

Hello everyone, I'm confused about light. I know when a photon with certain matching energy comes, it excites the electrons to a higher orbital, and releases a photon when it comes back. 1. What happens to the orginal photon that lost energy? 2. I then read about absorption and reflection, then they were talking about resonance. I don't understand how what I described above with photons apply to reflection and absorption. Can anyone explain me to me with photon theory what happens in absorption and reflection. Thanks

In inflammation they say capillaries dilate and become more permeable. I want to know how they dilate in this case?

Thanks for the response Are you saying that when the artery attached to capillary constrict or dilate, the capillary follows in the same direction?

Hello everyone, Capillaries are just a single layer of endothelial cells with no muscle tissue so how do these constrict? Thanks

Oh I see. Thanks a lot for your help . Upto this time I was thinking about intracellular things. Glad to get back on track

I see thanks for the help However the balloon might expand atleast a little bit if I suddenly decrease the atmospheric pressure right? It might not equalize it.

Oh yes lol, thanks again I have just one last question with regard to nutrient uptake by capillary cells. So according to your picture are there minute gaps in the purple region that are not visible. Is it through these gaps that nutrients enter the capillary tube?

Thanks for the response If the balloon is in equilibrium how come its internal pressure is not equivalent to atmospheric pressure? Do you mean that the ballon does expand because it has higher pressure but it can only do that for a certain limit.

Hey thanks for help It did make it a lot clear but I still have just one question. Let's say this was a capillary tube 0 0 0 0 0 0 0 0 <---- Then a redblood cell coming in from that direction, how does it pass without getting blocked by an endothelial cell?

Hello guys, This is simple question but I have gone completely blank. Ok let's say there was a balloon outside that was inflated. This means that it has expandes so it's pressure is equivalent to atmpospheric pressure right? So when I pinch it why does air escape, how does balloon suddenly have higher pressure to make air move out? Is pinching the balloon equivalent to making the volume of the ballon smaller. Thanks

Thanks for the response Are red blood cells smaller than capillaries, or do they squish? Merged post follows: Consecutive posts merged This has been another question. How do capillaries take up nutrients, do the endothelial cells take it up intracellularly and then pass it or do they fit into the gap of endothelial cells? Also if some capillaries can't allow blood cells to pass through, that mean the veins connecting to those capillaries won't have red blood cells right?

Hello guys, A capillary is made up of a single layer of endothelial cells right. So when blood cells pass through it, do the endothelial cells take blood cells up by endocytosis and then release it to other side. Thanks

Thanks for the response I don't understand the 12th fret analogy. When I hold the finger at 12th fret are there 2 vibrations in the 2 parts of the string separated by the finger. I thought only the area from the bridge to the 12th fret vibrates. This is my misunderstanding 1. When I hold a string does the whole string vibrate or the area up to my finger. Also when I play the 12th fret are harmonics still created in the string? 2.When you hold the string somewhere does the fundamental frequency change to something else? Is that how you get different notes.

Thanks Captain now I know what happens but I still have a small question. So if all frequencies are played at the same time, does that mean some atoms in the string vibrate at different frequency to other. I just can't visualize an object vibrating at many frequencies. For example if I push a swing it would go up and down at a fixed rate right, it can't do many things at once.

Thanks for the response I have just one question left. When each string vibrates at many natural frequencies, how does this occur? Does one part of the string vibrate at a different frequency to other parts of the string? I don't understand how a string could vibrate at many frequencies at the same time? One after another I can understand.

Hello guys, I just have few questions about this. Now I understand how a standing wave is formed. However I'm unsure what the nodal points are if I pluck an open string. Is it the headstock and the bridge? 1. If each guitar string has harmonics, how does this occur. I read that it can vibrate at many natural frequencies but I don't understand how a string could vibrate at many natural frequencies at once to create harmony? Does this occur at once or is it like one type vibration, and then another type of vibration. 2. Do you need resonance to create standing waves. I'm thinking not because all you need is to pluck the string to create a standing wave. 3. When I hold the string at a particular note, let's say a string in second fret, then where are the nodal points? Is it between the headstock and where I placed the finger or is it between the bridge and the place where I placed the finger? Thanks a lot for any help in advance

Hello guys, I don't know much about brain and stuff I only know a bit about action potential. My question is I can understand how sensory nerves by a stimulus, but let's say I want to pick a pen. How does brain initiate the action potential for that? This might have been dicussed before but I'm not sure what to type in google to find the answer. Thanks

Thanks for the help Skeptic I can understand why they would stay as ionized now, but I have a question about the reaction that occur in the cathode and anode. I can understand how reduction reaction can occur in the catode because they supply electrons at that end, but in the anode what make the ion lose its electrons thanks