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I don't understand where the picture or the question comes from - there's no background involved.Can a free electron absorb/emit photons?It cannot. The reason is that this would violate energy-momentum conservation.A photon has energy [math]E = \hbar\omega[/math] and momentum [math]pc = \hbar\omega[/math].A free particle has energy [math]E^2 = (m c^2)^2 + (pc)^2[/math] with momentum [math]p[/math] and rest mass [math]m[/math].The analogy of what I'm going to do is very much like a classical scattering process.If a free particle absorbed a photon, then energy conservation requires     [math]\hbar\omega + mc^2 = \sqrt{(mc^2)^2 + (pc)^2}[/math]and momentum conservation requires    [math]p = \hbar k = \frac{1}{c}\hbar \omega[/math]Plug this into the equation above    [math]\hbar^2 \omega^2 + 2\hbar\omega mc^2 + m^2 c^4 = m^2 c^4 + \hbar^2 \omega^2[/math]This shows that     [math]2\hbar\omega mc^2 = 0[/math]where [math]m[/math] is the mass of the free particle and both [math]\hbar[/math], [math]c[/math] are constants. Therefore, this states [math]\omega = 0 \Longrightarrow E = 0[/math]. There isn't a photon with vanishing energy, so this process can't occur.Notes: the only assumption is that the free particle in question (here, an electron) has no internal structure. This wouldn't necessarily be true for a "free atom" which has an internal structure, but an electron is considered a fundamental point particle.Does an electron "classically" spin?No. This is an example (one of many) where Physicists absolutely suck at using the English language. The spin here is not the classical analogue of a planet spinning on its axis. The spin of an electron refers to an intrinsic property due to angular momentum. An electron has two forms of spin, the intrinsic spin of [math]\pm \frac{1}{2}[/math] and an orbital angular momentum which is due to its orbit about an object, such as the nucleus of an atom. Like many things in nature, we can only infer the concept of spin from experiments like the Stark Effect, the Zeeman Effect, the Stern-Gerlach experiment, etc. It's this concept of spin that allows us to classify an electron as a fermion, and generates the Pauli exclusion principle.

Lets us compare Zerodha and Angel Broking through various features offered by them and their respective pricing. Then we can easily decide which is the better one.1. Account Opening ChargesEven though Zerodha costs you Rs 200 during account opening, but you will save Rs 150 yearly at Zerodha on AMC Charges as compared to Angel Broking. So, Zerodha has the upper hand in this case in the long run.2. Brokerage PlanDelivery orders are FREE in both cases. In rest all segments, you pay Rs 20 per transaction for both cases. However in Zerodha, your brokerage can be lower than Rs 20 ie 0.01% of tra...

Which is better, Zerodha or 5paisa.com?The necessary comparison between two discount brokers Zerodha and 5paisa are tabulated below:BRIEF INTRODUCTIONZERODHAZerodha , an Indian financial service company which was formed in the year 2010 by two founders, Nithin and Nikhil Kamnath. It is headquartered in Bangalore and is available in major cities across the country. It provides trader to trade in various segments: Equity, commodity, F&O, currency trading and Mutual Funds. They provide three main platforms available in KITE and PI, for web-based KITE Web and KITE Connect, desktop-based PI and mobile-based KITE Mobile. It is registe...

I am an Online Marketer and here I am going to describe all the genuine way to earn online, and also mention online frauds to aware students and people who sometimes struck in these type of frauds.——————WARNING——————If you finding some shortcuts to earn well in short-term of the period, then sorry to say, by this tricks you can earn definitely but all your earning is depends on your efforts.Url Shorteners-Go to Google and search - “URL Shortener Paid Sites”Register on the website after reviewing the websiteChoose a YouTube Video, Website Blog and copy the URL.Short your URL and Share in soc...

Do you agree that Drs. Sheridan and James' study “complaints of group-stalking (gang-stalking): an exploratory study" is, at best, shoddy research?Yes. 20 reasons why the signNow entitled "Complaints of group-stalking ('gang-stalking'): an exploratory study of their nature and impact on complainants" by Dr. Lorraine Sheridan and Dr. David James (published online in 2015) - concluding that all people alleging organized group harassment are delusional - is, at best, shoddy research.P​reface - My name is Richard Griesinger. During the 50 years I lived in Pinellas County, Florida USA, I was never harassed by local law enforcement until just days after I started dating my ex-girlfriend (Jennifer Brunner) - the divorcing, soon to be ex-wife o...

Lets us compare their charges & facilities one by one. Then you can decide for yourself which one to choose.1. Account Opening ChargesEven though Zerodha costs you Rs 200 during account opening, but you will save Rs 240 yearly at Zerodha on AMC Charges as compared to Angel Broking. So, Zerodha has the upper hand in this case in the long run.2. Brokerage PlanHere we see that in case of Delivery, Zerodha is completely free whereas 5paisa will charge you Rs 10 irrespective of traded amount (Note: 5paisa will charge you Rs 10 brokerage even if you purchase a single share of Rs 15). In all other...

I would be the man who wreaks havoc in the galaxy at first. Not necessarily because I wanted to, but because I don’t think it could happen any other way. I guess I’d become “sort of” a Grey Jedi, but then much more than that later on.For this answer, I’m going to assume that I’m going into the Star Wars Universe with all my knowledge intact (as in I’ve seen the original trilogy, prequels, both the Clone Wars series (and movie) and am up to date on Star Wars Rebels).I will also abandon the idea of midichlorians.Since it was not specified what time period I will be placed in, I will have to c...

Pathophysiology of hemiplegic posture?Nothing in biology makes sense except in the light of evolution. .                                                                                                -T. Dobzhansky The evolution of the somatomotor system is undoubtedly complex with evolving life forms acquiring new motor and behavioral adaptations and new motor skills over a very long period of time-- hundreds of millions of years. In the course of motor evolution, animals acquired the ability to maintain adaptive postures and to move body parts in a coordinated fashion. To answer the question, some degree of simplification is...