Calculate the frequency of a photon released from a hydrogen atom during a transition from n=7 to n=4
The answer is 1.38 x 10^14 Hz
but i dont know how to get that answer.
can someone please help me out.
thank you
What is the molar concentration of sodium ions in a 0.350 M Na3PO4 solution?
The answer is 1.05 but i dont know how to get that answer.
can someone please help me understand this?
thanks
