Electrons in the lower of two spin states in a magnetic field can absorb a photon of the right frequency and move to the higher state. (a) Find the magnetic field magnitude BB required for this transition in a hydrogen atom with n = 1 and l = 0 to be induced by microwaves with wavelength . Express your answer in terms of the variables , m, e, and c. (b) Calculate the value of B for a wavelength of 3.40 cm.