A physics professor wants to perform a lecture demonstrationo f Youngs double-slit experiment for her classusing the 633-nm light from a He-Ne laser. Because thelecture hall is very large, the interference pattern w ill beprojected on a wall that is 5.0 m from the slits. For easyviewing by all students in the class, the professor wants thedistance between the m = 0 and m = 1 maxima to be25 cm. What slit separation is required in order to producethe desired interference pattern?
Obama’s DNC Address On behalf of the great state of Illinois... (APPLAUSE) ... crossroads of a nation, land of Lincoln, let me express my deep gratitude for the privilege of addressing this convention. Tonight is a particular honor for me because, let's face it, my presence on this stage is pretty unlikely. My father was a foreign student, born and raised in a small village in Kenya. He grew up herding goats, went to school in a tin- roof shack. His father, my grandfather, was a cook, a domestic servant to the British. OBAMA: But my grandfather had larger dreams for his son. Through hard work and perseverance my father got a scholarship to study in a magical place, America, that's shown as a beacon of freedom and opportunity to so many who had come before him. (APPLAUSE) While studyi