Let me give u an eg. while making coffee, u put large sugar crystals. To dissolve it takes a long time. But, if instead if u put fine sugar particles, it quickly dissolves and the reaction is quick.so when u make the bulk material into very tiny particles, the surface area is increasing , which leads to quick chemical reaction. whereas, in bulk the molecules are hold tightly and the surface area is minimum. And for smaller particles, when u impinge electromagnetic wave, it takes the energy in the form of quantas ie.. hnew, 2hnew, 3hnew and so on... but not 1and half hnew, 2 and half hnew.....so the partilces can absorb and emit light in quantas.this is quantum effect.--Nidya...
Let me give u an eg. while making coffee, u put large sugar crystals. To dissolve it takes a long time. But, if instead if u put fine sugar particles, it quickly dissolves and the reaction is quick.so when u make the bulk material into very tiny particles, the surface area is increasing , which leads to quick chemical reaction. whereas, in bulk the molecules are hold tightly and the surface area is minimum.
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