Buda Academic Chemistry CH 5.1- Light, Energy, Wavelength, Frequency

electromagnetic radiation

form of energy that exhibits wavelike behavior as it travels through space

What are some example of electromagnetic radiation?

visible light, sun, microwave, etc

wavelength (λ - lambda)

shortest distance between equivalent points

What does "λ" symbol stand for?

lambda

frequency (ν - nu)

number of waves that pass a given point per second

amplitude

wave's height from the origin to a crest or trough

crest

the highest point of a wave

trough

the lowest point of a wave

Frequency and wavelength are inversely ___________________.

proportional

electromagnetic spectrum

encompasses all forms of electromagnetic radition

All electromagnetic waves travel at the same ________.

speed

c=λν

equation to find the speed of light

What does "c" stand for in the equation 'c=λν'?

speed of light (3.00×10^8 m/s)

What does the "λ" stand for in the equation 'c=λν'?

wavelength (m, nm, etc.)

What does the "ν" stand for in the equation 'c=λν'?

frequency (Hz, s^-1, or 1/s)

The wavelengths become (bigger/smaller) as you move down the chart (to the right).

smaller

quantum

minimum amount of energy that can be gained or lost by an atom

photoelectric effect

electrons are emitted from a metal's surface when light of a certain frequency shines on the surface

As the frequency increases on the electromagnetic spectrum, the energy (increases/decreases).

increases

What does a wave represent according to Einstein?

particle duality

What does a photon represent according to Einstein?

a massless particle that carries a quantum of energy

What are the equations for finding energy?

E=hν, E=hc/λ

What does "E" stand for in the equation for energy?

energy (J or Joules)

What does "h" stand for in the equation for energy?

Planck's constant (6.626 x 10^-34 Jxs)

What does the "v" stand for in the equation for energy?

frequency (Hz, s^-1, 1/s)

What does "c" stand for in the equation for energy?

speed of light (3.00x10^8 m/s)

What does "λ" stand for in the equation for energy?

wavelength (m)

Frequency and wavelength have a (direct/inverse) relationship.

inverse

Frequency and energy have a (direct/inverse) relationship.

direct

Practice Problem: How many Joules of energy are there in one photon of orange light whose wavelength is 630nm?

E = 3.2*10^-19 J

Practice Problem: Violet light has a wavelength of 4.10 x 10-12 m. What is the frequency?

v = 7.32*10^19 Hz

Practice Problem: Calculate the energy (E) and wavelength (λ) of a photon of light with a frequency (ν) of 6.165 x 1014 Hz.

λ = 4.86610^-7 m / E = 4.08510^-19

Conversion Factor: 1 m = _______ mm

1*10^3 mm

Conversion Factor: 1 m = ________ nm

1*10^9 nm

Conversion Factor: 1 kHz = _________ Hz

1000 Hz

Conversion Factor: 1 MHz = _________ Hz

1*10^6 Hz

atomic emission spectrum

a set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors

ground state

The lowest energy state of an atom

excited state

when an atom absorbs energy, its electrons move to a higher energy level

wavelength

Horizontal distance between the crests or between the troughs of two adjacent waves