- Why an electron jumps to higher energy level?

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Why is there 24 minute parking curbs? A scale drawing of a rectangular room has dimensions 72 feet by 40 feet. The scale to be used is 1 in : 8 ft. What will be the perimeter? Laura has a bag of jelly beans she eats 3/8 of them, she has 15 left how many jelly beans were in the bag.? What's the difference between a new moon and an eclipse of the moon? How to solve integral of sin^2 x cos^4 x dx? using tri integral or sub.?