- #1
srikkanth_kn
- 12
- 0
Hi
This might seem odd but I need to explain my friend on this
Friend and I agreed that Classical physics is time reversible (i.e. laws remain same if time is reversed.. e.g. gravitational pull on a projectile.) only exception is II law of Thermodynamics (which talks of irreversible decrease in differentials of two interacting systems)
But coming to electromagnetics we hit a road block
An incandescent bulb glows by joule heating - i.e electrons from a battery are hitting ions in tungsten and that causes excited tungsten ions to realse photons.
But if we reverse time and assume the laws to hold the same, then tungsten can set electrons in motion by absorbing photons. But in real world this means that we can have light bulbs acting as photovoltaic cells !
But Classical physics is time reversible on non-quantum macro scale (isnt it ?). Which means light bulbs can be photovoltaic cells. so we are stuck there. Can we solve this without touching on quantum mechanics ?
Thanks in advance for answers
This might seem odd but I need to explain my friend on this
Friend and I agreed that Classical physics is time reversible (i.e. laws remain same if time is reversed.. e.g. gravitational pull on a projectile.) only exception is II law of Thermodynamics (which talks of irreversible decrease in differentials of two interacting systems)
But coming to electromagnetics we hit a road block
An incandescent bulb glows by joule heating - i.e electrons from a battery are hitting ions in tungsten and that causes excited tungsten ions to realse photons.
But if we reverse time and assume the laws to hold the same, then tungsten can set electrons in motion by absorbing photons. But in real world this means that we can have light bulbs acting as photovoltaic cells !
But Classical physics is time reversible on non-quantum macro scale (isnt it ?). Which means light bulbs can be photovoltaic cells. so we are stuck there. Can we solve this without touching on quantum mechanics ?
Thanks in advance for answers