The Modern Atomic Theory

Electrons need specific amounts of energy to "jump" off an atom and be emitted.

Niels Bohr

Kumar is producing the photoelectric effect by using red light. He wants to increase the energy of emitted electrons. Based on the research of Albert Einstein, what is the best way for him to do this?

Use a different colored light that has a higher frequency.

Which statement about the electron-cloud model is true?

a. It is the currently accepted atomic model.

The modern-day quantum model of the atom is better than John Dalton's model because it

answers many questions about atoms.

Which statement about Niels Bohr's atomic model is true?

b. Each orbit has a specific energy level.

How does the electron-cloud model describe electrons?

c. An electron has a high probability of being in certain regions.

According to the Bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level?

c. Energy is absorbed and then released to form an emission line.

The diagram shows Niels Bohr's model of an atom. What happens when the electron moves from the first energy level to the second energy level?

c. Energy is absorbed by the atom.

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?

c. It contradicted the Heisenberg uncertainty principle.

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy) In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect?

c. bright red light

A change in which property of light will have no effect on whether or not the photoelectric effect occurs?

c. intensity

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model?

d. Electrons need specific amounts of energy to "jump" off an atom and be emitted.

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect?

d. Energy of electrons depends on light's frequency, not intensity.

Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons Which model is Natalie most likely examining?

d. electron-cloud model