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Suppose I have a em wave train.How do I know how many photon does it contain?And where are the photons?(like in the middle or more toward the end of the wave train)The frequency of light that we get from bulbs or sun can be measured so we can accurately state its energy .In this case where does the uncertainty in time ?Moreover when it hits the detector we know about its position so how it causes the uncertainty in momentum?

Aakash Ghosh
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  • Good questions but around here you want get too many answers that may inadvertently acknowledge the idea that photons could actually be real and individual particles. Everyone talks about duality but seam to only consider waves. Funny thing is particles can be described, even to answer your questions above but waves cannot be described without incorporating billions of individual photons. – Bill Alsept Oct 05 '18 at 15:32
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    You should consider splitting this into separate questions. –  Oct 05 '18 at 15:49
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    Possible duplicate of What is the relation between electromagnetic wave and photon? – sammy gerbil Oct 05 '18 at 16:03
  • Spin (or helicity, actually) of photons define the polarization (of photon, and the resulting EM wave).
  • $E = n \hbar \omega$ where $n$ is the number of photons and $\omega$ is frequency.

    • I think it would be useful to refer to these: https://physics.stackexchange.com/q/154468/133418, https://physics.stackexchange.com/q/397451/133418

    – Avantgarde Oct 05 '18 at 21:09