calculate the value of retarding potential needed to stop the photo electrons ejected from the metal surface of work function 1.2eV with light frequency 5.5*10 power 14 sec power -1
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what is the author's main purpose in the text? A. to argue that humans are capable of acting unselfishly altrustic towards others B. to prove that people can be altrustic for rewarding feeling, without being selfish
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