5.1 & 5.2 - Light & Quantum Theory

The wavelength of a wave is measured from __________.

• crest to crest

• crest to trough

• origin to crest

• origin to trough

What is the wavelength of a radio wave having a frequency of 3.75 x 10⁷ Hz? Remember, c = λ x v.

• .08 m

• 0.8 m

• 8.0 m

• 80 m

Which of the following power sources makes use of the photoelectric effect?

• solar power cells

• nuclear power plants

• alkaline batteries

• diesel engines

What is the energy of a single photon of light from hydrogen's 656 nm emission? Use h=6.626 x 10^-34 Js and c=3.00 x 10⁸m/s.

• 1.30 x 10^-31 J

• 1.30 x 10^-31 J

• 3.30 x 10¹⁸ J

• 3.03 x 10^-19 J

Which of the following electromagnetic waves has photons of the highest energy?

• microwaves

• infrared

• x-rays

• ultraviolet

What is the maximum number of electrons that can be present in each principal energy level of hydrogen?

• n

• n²

• 2n

• 2n²

What is the lowest energy state of an atom called?

• the ground state

• the excited state

• the solid state

• the chaotic state

The concept that all moving particles have wave characteristics is attributed to ___________.

• de Broglie

• Thomson

• Heisenberg

• Bohr

In this figure, why must the photon's wavelength increase after the collision?

• The photon changes direction.

• The photon changes speed.

• The photon gives up some energy to the electron.

• The photon starts spinning.

 In this figure, why are there dots beyond the "boundary" of the atomic orbital?

• the boundary encloses the volume in which the electron is found 90% of the time

• the boundary is three-dimensional, while the picture shows only two dimensions

• experimental error

• the boundary encloses the volume in which the electron is found 50% of the time