An electron for a hydrogen atom absorbed enough energy to move to the third energy level and immediately returned to ground state, emitting the energy it absorbed. A second hydrogen atom had its electron absorb the same amount of energy but, instead of returning directly to ground state, it moved to the second energy level and then to ground state. What can be said of the energy emitted by these two electrons that took different paths?

1a) Use the table below to determine the energy in eV of the photon absorbed when an electron jumps up from the n = 1 orbit to the n = 2 orbit of a hydrogen atom. =_________ eV 1b ) Use the table shown below to determine the energy in eV of the photon emitted when an electron jumps down from the n = 3 orbit to the n = 2 orbit of a hydrogen atom.=___________ eV

10. An electron has been placed at the origin. The grid spacing is 1 Angstrom per small square this time. Now you have a nucleus with 18 protons at x = 2.1 Angstroms on the x-axis. How much work would it take to bring in ANOTHER nucleus with 14 protons from 1 m away and place it at y = 8.0 Angstroms on the y-axis?     165.2 eV     413.1 eV     -25.2 eV     438.2 eV

What two pieces of evidence allowed the first calculation of me , the mass of the electron?(a) The ratios qe / me and q p / m p .(b) The values of qe and EB .(c) The ratio qe / me and qe .Justify your response.

(a) After J. J. Thompson experimentally discovered the existence of electrons in 1897, he went on to propose the plum pudding model of matter. What was the plum pudding model? What did Ernest Rutherford conclude about the structure of matter based on his experimental results from bombarding gold foil with alpha particles? (b) What was the proposed atomic model of matter put forward by Rutherford? Theoretically what was the problem with his proposed model of the atom? (c) What was the modification made by Niels Bohr to Rutherford's model, i.e., what were the assumptions that Bohr made for his version of the atomic model of matter? (d) What observational phenomena was Bohr's proposed model able to explain? How did his model explain these phenomena? (e) Draw an energy level diagram with one representative transition to support your answer to part (d).

Assume a hypothetical atom with a nucleus that consists of two positrons (instead of two protons). Positron has a charge of +1 and the mass of an electron. Write down the hydrogen like energy of a neutral 2-positrons atom.

The work function of a metal is is 2.04 e V. What will be the frequency of light required to eject electrons? * (2 Points) 3.2 x10 ^15 Hz O 4.2 x10 ^15 Hz O 3.2 x10 ^15 Hz 4.9 x19 ^14 Hz

An electron with 2.2 eVeV of kinetic energy collides with an atom whose energy-level diagram is shown in (Figure 1).   The electron kicks the atom into an excited state. What is the electron's kinetic energy after the collision? ANSWER IN EV