Beam of photons: EM radiation or light

1) After imparting h energy to the electron where did the photon go?

2) Are momentum/Energy conserved in the process? And if they are  then explain how?

3) What actually are free electrons and why do they exist?

4) What exactly is a photon? I mean what are the dimensions of the photon? is it a real particle? Can we picturise it?

5) How many packets of energy are contained in a ray of light from sun to earth?

6) If an electron is moving in space with some velocity 'v', what type of wave will be created by its motion?

7) Why the concept of intensity differ in wave and particle nature of EM radiation or light?

8) Is there energy associated with a matter wave? (de Broglie Wavelength)

9) How can you show energy is conserved in photoelectric effect?

10) How can there be momentum without mass? wrt. photon

11) The particle nature of life must effect our surroundings, for eg. the eye lens through which we see life, the walls, the rocks etc. Do light degredate these materials or it has no effect on them? Why these phenomenons are commonly not observed? 

photon is just an energy packet which when colloids with electron.. transfers its energy n gets dissapeared... czz a mass can never exist without energy... energy n momentum are always conserved...... photon is a energy packet woth certain mass... but no charge.. it is nt deflected in electric n magentic fields.. it is deflected in gravitational fields.. definite dimensions cannot  be found out since light behaves as particle nly during sum phenomena....

when an electron moves with a velcity V ... it is associated with MATTER WAVES... which can be given by De-Broglie's equation... Intensity is that property which intensifies a material.... in particles inorder  to achieve that... No of particles colloiding per second  must be more... in wave it is different.....

photon is a theoretical concept........... remember this........ wen we talk of energy transfer we talk it in terms of photons.........