Recent content by mkj

hi all, i am interested in MRI, and i wish to know what is the scientific theory telling us that the spins will precess in phase if they were placed in an external field and exposed to a 90° RF pulse. what i know is that the nuclei will precess at the same angular frequency (or same angular...

i am reading about MRI. i have seen several in several textbooks that the angle between the direction of the proton magnetic moment μ and the direction of the external magnetic field is 54.7 how did they find that theoretical or experimental if theoretical how can we calculate that

i no that the frequency range limits are determined by the cochlea where the low frequency sounds are localized on one terminal and the high frequency on the second end, but i am wondering if there exist a formula that permits to calculate these ranges analytically

In the least number of words can anyone explain for me if the results presented in paper are right or wrong. if right does it contradict the law of physics. if wrong why?

hello, we have learned that according to the laws of thermodynamics that the efficiency of any machine should be less than one because of the passive components in it. in an electric heating machine all the input electrical energy is converted to heat. Does this make the electrical heater as an...