Light shining on the surface of a photomaterial causes the

Who championed the idea of the atom about 400 BCE? (9.1) (a) Aristotle (b) Plato (c) Democritus (d) Archimedes

Which scientist is associated with the plum pudding model of the atom? (9.1) (a) Thomson (b) Rutherford (c) Bohr (d) Dalton

Planck developed his quantum hypothesis to explain which of these phenomena? (9.2) (a) the ultraviolet catastrophe (b) line spectra (c) the photoelectric effect (d) uncertainty

Light of which of the following colors has the greatest photon energy? (9.2) (a) red (b) orange (c) yellow (d) violet

The Bohr theory was developed to explain which of these phenomena? (9.3) (a) energy levels (b) the photoelectric effect (c) line spectra (d) quantum numbers

In which of the following states does a hydrogen electron have the greatest energy? (9.3) (a) n 5 1 (b) n 5 3 (c) n 5 5 (d) n 5 7.5

Bombarding a metal anode with high-energy electrons produces which of the following? (9.4) (a) laser light (b) X-rays (c) microwaves (d) neutrons

The s in the acronym laser stands for (9.4) (a) simple (b) specific (c) spontaneous (d) stimulated

Explain the difference between a photon of red light and one of violet light in terms of energy, frequency, and wavelength.

Light shining on the surface of a photomaterial causes the ejection of electrons if the frequency of the light is above a certain minimum value. Why is there a certain minimum value?

What scientist won the Nobel Prize for explaining the photoelectric effect? Name another theory for which that scientist is famous.

How does the number of lines in the emission spectrum for an element compare with the number of lines in the absorption spectrum?

Does light from a neon sign have a continuous spectrum? Explain

In the Bohr theory, principal quantum numbers are denoted by what letter?

Why was it necessary for Bohr to assume that a bound electron in orbit did not emit radiation?

Distinguish between a ground state for an electron and an excited state

How many visible lines make up the emission spectrum of hydrogen? What are their colors?

How does the Bohr theory explain the discrete lines in the emission spectrum of hydrogen?

How does the Bohr theory explain the discrete lines in the absorption spectrum of hydrogen?

In which transition is the photon of greater energy emitted, n 5 3 to n 5 1 or n 5 2 to n 5 1?

A hydrogen electron is in the excited state n 5 3. How many photons of different frequencies could possibly be emitted in the electrons return to the ground state?

Why does a microwave oven heat a potato but not a ceramic plate?

What does the acronym laser stand for?

What is unique about light from a laser source?

Why should you never look directly into a laser beam or into its reflection?

Why are X-rays called braking rays in German?

State Heisenbergs uncertainty principle.

Why isnt Heisenbergs uncertainty principle relevant to everyday observations?

What is a matter wave, and when is the associated wavelength significant?

Niels Bohr was never able to actually explain why a hydrogen electron is limited to certain orbits. How did de Broglie explain it?

How was a beam of electrons shown to have wave-like properties?

What useful instrument takes advantage of the wave properties of electrons?

What scientist is primarily associated with the electron cloud model of the atom?

What other name is often used to refer to the electron cloud model of the atom?