Medicare enrollment begins 3 months before your 65th birthday. And you will be automatically enrolled Medicare<span> Parts A and B effective the month </span>you<span> turn 65.</span> Hope that helps you at least a bit ^^
You can have private insurance but you must have insurance. Medicare can work with or supplement some private insurance plans- you are not required by law to have Medicare*
The transitions which fall to the lowest principle position release the greatest energies. In this case, this would be the transition from the 5p to the 3s orbital (a Paschen transition).