A radio wave has a frequency of 20.0 MHz. (a) What is the speed of this electromagnetic radiation in a vacuum? (b) What is the wavelength of this light? (c) What is the energy of one photon of this light? (d) What is the energy of one mole of photons of this light?

It is interesting to speculate on the properties of a universe with different values for the fundamental constants.(a) In a universe in which Planck’s constant had the valueh =1 J s, what would be the de Broglie wavelength ofa 145-g baseball moving at a speed of 20 m s-1 ?(b) Suppose the speed of the ball from part (a) is known to lie between 19 and 21 m s-1. What is the smallest distance within which it can be known to lie?(c) Suppose that in this universe the mass of the electron is1 g and the charge on the electron is 1 C. Calculate the Bohr radius of the hydrogen atom in this universe.

Calculate the energy (in eV) and wavelength (in meter) of a photon whose frequency is (a) 88.0 THz, (b) 48.0 MHz,  (c) 5.30 GHz. State the classification and application of each on the electromagnetic spectrum.

(a) Assign a proper spectroscopic symbol (spdf...) to each subshell having the following set of quantum numbers n and I. (b) Indicate the number of orbitals in each subshell. (c) What is the maximum number of electrons that can be assigned to each subshell? If the answer is "none", give your reasoning. (a) n= 6,1 = 0; (b) n= 3, 1= 2; (c) n= 2,1 = 2; (d) n= 5, 1= 1; (e) n= 4,1= 3;