When drawing a bohr diagram for a hydrogen atom, if the element is in the 4th
excited state how many energy shells would you draw?

What is the rate of change in a objects position?

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?