 
			 
			MCQOPTIONS
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				| 1. | Bohr’s second postulate defines that an electron revolves only in those stable orbits where its angular momentum 'L' is some integral multiple of 'h/2π' where 'h' is the _________ constant. | 
| A. | Planck ’s | 
| B. | Rydberg's | 
| C. | Bohr's | 
| D. | Thomson’s | 
| Answer» B. Rydberg's | |