Someone please help me understanding the quantum mechanics

You can start with the first few chapters of Eisberg's fundamentals of modern physics or Weidner and sells' Elementary modern physics.

 

Well, you should say what is not clear for you so that people can explain and clarify it.

 

All right.

Lets take it one step at a time.

Exactly what isn't clear in the following:
http://en.wikipedia.org/wiki/Ultraviolet_catastrophe

Classical statistical mechanics predicted a clearly unphysical result for a black body:
'According to classical electromagnetism, the number of electromagnetic modes in a 3-dimensional cavity, per unit frequency, is proportional to the square of the frequency. This therefore implies that the radiated power per unit frequency should follow the Rayleigh–Jeans law, and be proportional to frequency squared. Thus, both the power at a given frequency and the total radiated power is unlimited as higher and higher frequencies are considered: this is clearly unphysical as the total radiated power of a cavity is not observed to be infinite, a point that was made independently by Einstein and by Lord Rayleigh and Sir James Jeans in the year 1905.'

What Plank did, by assuming the cavity could only absorb and emit radiation in discreet units the problem was solved - and actually matched experiment if a certain value was chosen for those units.

Thanks
Bill

 

Braam Gaasbeek has a good introductory text to start learning quantum mechanics. Everything looks great except for the last chapter on philosophy, which I think is wrong. Philosophy in quantum mechanics is very important, and for that I recommend either Landau and Lifshitz's or Steven Weinberg's quantum mechanics texts.

http://arxiv.org/abs/1007.4184
An Introductory Course on Quantum Mechanics
Bram Gaasbeek