Explain in which level was it before the photon
If the electron returns to the ground state, explain in which level was it before the photon was emitted where a hydrogen atom in an excited state emits a photon of frequency = 2.924 x 1015 s-1.
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On the periodic table the atomic weights are said to be "relative weights." Then explain - relative to what? Assume the Helium atom was assigned an atomic mass of 1.0000 amu, Calculate the mass of 1 mole of sodium atoms.
At noon passenger ship was 40 miles north of port traveling at 30 mph, while tanker was 30 miles east of port traveling 20 mph. Find theta to nearest 10th of the degree.
A solid having the sample of A 27.13-g is placed in a flask. The solid is insoluble in the Toluene, is added to the flask so that the complete volume of liquid and solid together is 50.0mL.
Determine the number of minutes does it take for the concentration of the reactant,[A], to drop to 6.25 % of the original concentration when a certain first order reaction has a rate constant of 5.70 *10-3 s-1 at 45 degrees C.
The weights of packets of cookies produced by the certain manufacturer approximately follow the normal distribution with mean of 202 grams and standard deviation of 3 grams.
Determine the number of grams of CO2 (Mm = 44.0 g/mol) are formed in the combustion of 19.0 g of C8H18 (Mm = 114.2 g/mol)?
A soft-drink vending machine is set so that amount of drink dispensed is normal random variable with mean of 200 milliliters and standard deviation of 15 milliliters. Determine the probability that X, the amount of drink dispensed (in milliliters)
A long strip of it is torn off and measured to be 5.6 m long and an adding-machine tape has a width of 5.80 cm. Translate the 5.6 m into centimeters.
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