Grad school for phd in NANOTECH??
I am planning for a Phd in Nanotechnology, particularly related to Molecular robotics/NEMS/MEMS/ and even nano-composites may do..though its not my first choice
currently i am pursuing B.Tech in Mech engg...and have Cumulative gpa (till 6th sem) of 8.7/10...
well not going into two much practical details of ballistics , consider two bullets identical in shape and physical properties execpt mass
b1,b2
considering no loss of energy
E(bullet)=P^2/2m
E(gun)=P^2/2M
Eb + Eg=constant(k)
P^2=(2k /(1/M + 1/m))
M is constant on increasing mass of...
the same that would be for 1D
taking time as parameter(t)
S=ut+0.5at*t
where S,u,a are vector quantities
so now writting in orthogonal for
Sz=Uz *t + 0.5 Az *t*t
Sz=component in zdirection
similiarly the rest of others
now the path would be parabolic but u might not necceserly get...
sorry but i can't figure how phonons are related to the ques. may be because i have yet not studied abt phonons , so let's take sound waves (vibrations) traveling through a metal bock
which is constitued by metal atoms at finite distances ,now can u explain how wave travel
through it by...
ya correct as distance tends to 0 speed acquires a finite value
but wat i am asking is that only continuous medium has infinite oscilators(particles)
wat abt real medium like a crytal which has finite no. of particles at a finite distance
how can it behave like a continuous medium
plx...
consider three particles A B C
when wave reaches A immidiately(after infinisimial time interval) a force act on B but since in solids the particles are at finite distance the speed which is distance/time must go infinite how does one explain that real mediums act as continuous please help
what about instantaneous transfer of vibration between neighbouring particles at finite distances making speed infinite(not taking the fact that force spreads with the velocity of light)is continuous medium distance between neighbouring particles is infinitesimial
so is time taken for vibration...
i got stuck in this doubt for past four years thinking that in higher classes i might get to know enough to answer the question ..but as you can see i am still in the pipeline..
thanks andy resnick i ,ll google on that..
i have a doubt in wave propagation in solids
wave propagation i have studied in school is in continuous medium
but real mediums are discreate how will we understnd wave propagation in them
-for wave to transfer from one particle to next takes infinitesimial time but since in continuous medium...
well in that working we first assumed that electromagnetic waves are longitudinal and then prooved that such waves are not consistent with gauss law and don't exist
but just mentioning that in a traverse wave the front and back face of parrellelopiprd will be// to electric field henceflux=0...
hey gearo here is the working
1)imagine a 3-d cordinate system
2) now suppose a longitudinal wave is traveling along X-axis (left To Right)
3)mark a pont on the X axis
4)draw a parallelopiped at that point of dimension(dx,dy,dz)
closedintegral(E)=0...no charge withen the...
what i have studied is that any change in the electric field travels in space with the speed of light...right
suppose any electric field generated by an infinite plane sheet of charge
E=\sigma/2\epsilon...where \sigma is surface charge density
now suppose \sigma is doubled...
in non inertial frames , a pseudo force act on the bodies
but is the work done by this force is real?
if it is ,will the law of energy conservation hold in non inertial frames too , as everything is gaining velocity due to pseudo acceleration.
I know that i am commiting some serious errors in this , but just can't notice them
suppose we have to find the recoil energy of an excited atom when it de excites
suppose the total energy of the process is E
an atom will emit a photon on returning to normal state . energy of the photon...