Calculate the frequency (Hz) and wavelength, A (nm) of the emitted photon when an electron drops from n = 5 to n = 3. (Given: Speed ​​of light, c = 3.00 x 1O ms ", Planck's constant, h = 6.63 10 J. s, Rydberg's constant, R = 2. 18 x 10J).​

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Which of the following units is not an official si unit? mole liter kilogram ampere

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