QUESTION-WHY DOES THE LIGHT GO OUT WHEN YOU TURN THE LIGHTS OFF?
On the face of it this sounds like a silly question but let me explain. Non coherent light is emitted from the light bulb when i turn the light on. Now while photons bound around the room and are absorbed and so more photons are created through the process of stimulating the atoms to release photons. In a Laser there is a process of stimulated emission by way of a lasing wavelength, now knowing this my question is under what circumstances do materials absorb photons but without the atoms being stimulated to re release a photon? Basically where does the energy of the light go if there if there is not enough light energy to stimulate the atom to release a photon again? Because if a photon is always emitted when a material absorbs a photon wouldn't light be present after one turned the light off?
QUESTION - NEUTRALITY OF MATERIALS
I'am aware of the laws that govern electric current and insulators and conductors and so forth. If i am say combing my hair i can transfer electrons to my hair. My question is how does say my hair or the comb or whatever regain electrons if positively charges or lose electrons if negatively charged? Like I said i'm aware of the law governing current and so obviously if i have an excess of electrons then i touch a conductor i get a shock as the electrons are transferred. But how would these additional electrons leave the negatively charged material otherwise? I read something about transferring to air molecules but was not sure about this. Or am I wrong to say that materials achieve neutrality after losing electrons and materials are constantly exchanging electrons between each other?
On the face of it this sounds like a silly question but let me explain. Non coherent light is emitted from the light bulb when i turn the light on. Now while photons bound around the room and are absorbed and so more photons are created through the process of stimulating the atoms to release photons. In a Laser there is a process of stimulated emission by way of a lasing wavelength, now knowing this my question is under what circumstances do materials absorb photons but without the atoms being stimulated to re release a photon? Basically where does the energy of the light go if there if there is not enough light energy to stimulate the atom to release a photon again? Because if a photon is always emitted when a material absorbs a photon wouldn't light be present after one turned the light off?
QUESTION - NEUTRALITY OF MATERIALS
I'am aware of the laws that govern electric current and insulators and conductors and so forth. If i am say combing my hair i can transfer electrons to my hair. My question is how does say my hair or the comb or whatever regain electrons if positively charges or lose electrons if negatively charged? Like I said i'm aware of the law governing current and so obviously if i have an excess of electrons then i touch a conductor i get a shock as the electrons are transferred. But how would these additional electrons leave the negatively charged material otherwise? I read something about transferring to air molecules but was not sure about this. Or am I wrong to say that materials achieve neutrality after losing electrons and materials are constantly exchanging electrons between each other?