In a simplified version of the solar system model (developed by niels bohr, a danish chemist), an electron resides in an excited h atom orbit with an energy of -38.42 j (initial state). if the electron drops to a second orbit (final state) with the energy -63.33 j, a photon will be emitted. what will be the energy of the photon (j)?
can someone show how to solve this problem and explain.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

Titration reveals that 11.6 ml of 3.0m sulfuric acid are required to neutralize the sodium hydroxide in 25.00ml of naoh solution. what is the molarity of the naoh solution?