Recent content by physicsqueen

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