- Why an electron jumps to higher energy level?

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Calculate the de Broglie wavelength of a 143-g baseball traveling at 89 mph.? Please Help!!
What is the mass (in grams) of 9.42 × 1024 molecules of methanol (CH3OH)? Are there clean water acts for tropical dry forests and why? How to know if a compound is aromatic by just looking at the formula? CHEMISTRY? Find the Left Riemann Sum that approximates the area under the curve of y=e^(4x) on the interval [0,2] with 8 rectangles.?