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In the old days, a cycle was is now a hertz(Hz). So 1 kilocycle=1000 Hz. Now the "M" means 1 million or 1*10 to the sixth power. 101 MHz=101 million cycles per seconed or 101 million Hz per seconed or 101 million vibrations per seconed.
1000000000/500000 = 2000 (of 500000 in a Billion pounds)
1,000 KHz = 1 MHz
50
Here is how you calculate a coupling constant J: For the simple case of a doublet, the coupling constant is the difference between two peaks. The trick is that J is measure in Hz, not ppm. The first thing to do is convert the peaks from ppm into Hz. Suppose we have one peak at 4.260 ppm and another at 4.247 ppm. To get Hz, just multiply these values by the field strength in mHz. If we used a 500 mHz NMR machine, our peaks are at 2130 Hz and 2123.5 respectively. The J value is just the difference. In this case it is 2130 - 2123.5 = 6.5 Hz This can get more difficult if a proton is split by more than one other proton, especially if the protons are not identical.