Physics 1- Radiographic Questions & Answers

Physics 1- Radiographic Questions & Answers at what radiofrequency do MR coils operate? - ANSWER: 64 MHz atomic nomenclature..? - ANSWER: - A = atomic mass - Z = atomic number +/- = valence state - # = number of atoms/molecules Bohr - 1913 - ANSWER: improved Rutherford's work to be more like a mini solar system. this is the model we still use today Dalton - 1808 - ANSWER: - element composed of identical atoms - similar properties - different from other atoms - eye and hook configuration - size and number of eyes/hooks are different for each element decimal and unit conversions - ANSWER: there are 4 ways to represent the decimal system: - fractional (1/10) - decimal (0.1) - exponential (10^-1) - logarithmic (-1.000) electron configuration...? - ANSWER: - k shell, n =1, 2*1^2 = 2 - L shell, n =2, 2*2^2 = 8 - M shell, n =3, 2*3^2= 18 - N shell, n = 4, 2*4^2 = 32 - the closer to the nucleus, the stronger the electron binding energy Faraday - ANSWER: - can have a stationary magnet, causes no change in the coil - when the magnet moves back and forth, creates a charge and flow in the coil glass envelope and housing - ANSWER: - outer cover - protective housing reducinf radiation leakage/scatter, lead lined, filled with oil to dissipate heat - if it gets too hot, oil expands power gets cut to cool down - vacuum so electrons can flow freely how to convert from cm to inches? - ANSWER: cm/2.4 = inches how to convert from kg to lbs? - ANSWER: multiply by 2.2