Electrons in Atoms Practice

The visible spectrum of light spans the range of approximately:

• 300-500 nm

• 400-600 nm

• 300-700 nm

• 400-700 nm

Energy levels of electrons in an atom are:

• continuous

• discrete

• random

• variable

A low-frequency wave has a __________ wavelength

• long
• short
• tall
• variable

A high-frequency wave has a __________ wavelength

• long
• short
• tall
• variable

The units of frequency are:

• meters/second
• cycles/meter
• cycles/second
• meters/cycle

The Brackett series of hydrogen emission lines represent drops in energy from higher levels to the __________ level

• n = 1
• n = 2
• n = 3
• n = 4
• n = 5

The emission spectrum for helium contains _____ lines than the hydrogen spectrum.

• more
• the same
• less
• it depends
• what's an emission spectrum?

The photoelectric effect shows that light

• is composed of waves
• can be divided into discrete wavelengths
• has properties of a particle
• is continuous

The photoelectric effect was first demonstrated by:

• Albert Einstein
• Robert Millikan
• John Dalton
• JJ Thomson

The amplitude of a wave is its:

• frequency
• height
• wavelength
• velocity