ring ring ring..... i oped my drozi eyes ..nd i stop the alarm ..its was just 5 am ....again i went my way ..after 10 mim i oped my eyes it was totaly dark ..i froced to wake early ..nd i want to my bathroom all the matter its over at 6 am ..again m late . to college .let it be ..sir may i coming sir .......but my sir didnt told any thing ..he kno very much abt me .!!
.the class was stated with drozi nd dreamy way ...i sat at back sir was explaining the concept of radiation ..its awesome !! i luv phy !! so interestedly i went face to it ....................
radiation ..it is the mode of transmission of heat through vaccum ..it will travel with out any medium it propagates electric nd magnetic together wit perpendicular each other !!! see this ..fig
almost it is acts as a light way .EMISSION POWER ( e ) : it is the amount of energy emitted per unit area of the body . e = Q/AT units = J/m2 S
if this energy is incidence to any body its will tranfor to 3 ways
absorption , reflection transmission
In physics, absorption of electromagnetic radiation is the way by which the energy of a photon is taken up by matter, typically the electrons of an atom. Thus, the electromagnetic energy is transformed to other forms of energy, for example, to heat. The absorption of light during wave propagation is often called attenuation. Usually, the absorption of waves does not depend on their intensity (linear absorption), although in certain conditions (usually, in optics), the medium changes its transparency dependently on the intensity of waves going through, and the Saturable absorption (or nonlinear absorption) occurs.
Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection.
In acoustics, reflection causes echoes and is used in sonar. In geology, it is important in the study of seismic waves. Reflection is observed with surface waves in bodies of water. Reflection is observed with many types of electromagnetic wave, besides visible light. Reflection of VHF and higher frequencies is important for radio transmission and for radar. Even hard X-rays and gamma rays can be reflected at shallow angles with special "grazing" mirrors. .....
my sir told the experiment of blackholes ..its very interesting topic in phy ...
the is room totaly closed with inside white paint becoz its will reflect all the EM waves ..nd having lit amount of air nd small bulb is kept ....nd it switched on the light flows that we kno ..wen u switch off the bulb ...wat happn to light ??? where it will go ...energy can not be distory ..but where it went ...white paint is gud reflector ..where its will go ...scientist did this for couple of year at last they fine that there is blackhole in side the room ..ya its there wen the bulb is on the light is emmited as will as they will from a small shadow above the bulb ..its acts as a blackhole ....finaly they concluded that blackhole can be created in side the room also ..any where in the earth .....!!!
blackbody its the body which totaly absorb all the radiation evn light also ..and its from blackhole !! they never came back ..normally scientist r doing evenly experiment on it ...kno the origin of the universe !!!
its as t = 0 , f = o nd a = 1
we kno that energy Q= A+F+T where absorption , reflection transmission nd a = A/Q f=F/Q t=T/Q therefore a+f+t=1
white body ..its is reverse of blackbody its will reflect all the things ..so all the color of the EM radiation will reflected so we will see like white in color than its called as white body !! \
=== today phy class is over !!
nd it is almost 7 now nd started chemistry ..this subject is boring nd i dont like it ...
it is the mistry of my subjec
u must ride very perfectly in the class while handling this organic !! \
nd very in stability of radicals
i dont kno clearly abt it but i kno the simple and small where the order of the stability of radicals is
ph
ph-c-ph > ph-c-ph > ph-c>3 o >2o>c where ph is any group
c is having radical electron 1o is one prime carbon
2o is two prime carbon
3o is tri prime carbon nd
c is methyl
and than stability of anions
ph
where the order of it is ph-c-ph>ph -c-ph >ph-c>Co >1o>2o>3o
here c has anions
electrophiles means eletro means electron nd philes means lovable
its means that the e- deficient nd seeks to center which e- is rich are called e- philers
and they r Lewis base nd today my rahman sir dint ask any question to me ..heeeee!!
nd than brake f me ...f just 30 mim ..
again its started
maths class i like very much ..nd i found to be that . in maths we can chill like any thing !!
we r in complex numbers its very interesting subject ..
my mam told we r fools that ....every one is doing problems like mechanistically life wit very crazy to get the answer .. stupids they even not get means checking the answer.if it is wrong u will do the sum to get the answer till it is correct ..but kno one says that my work stud be correct kno we is confidence in there work ....so we must work through the concept it leads to finish like thats it ! u goal is prefect way !! bell rang ..shat !! bell rang very fastly its over ..some times we think some gud lecture must go on ..but bell rang na ...we stoped the class ..the time running to 11
nd i stated to my home !!
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