Emission Spectra, Heisenberg Uncertainty, Photoelectric Effect

Question 1

line emission spectrum

Answer 1

is unique for each individual element, it’s a spectrum (colors) of frequencies emitted as an atom goes from high to low energy states. It’s like an element’s fingerprint which can be used to ID an element.

Question 2

What instrument do you use to see how much light an element absorbs or emits?

Answer 2

spectrophotometer

Question 3

What is the Energy of photon equation?

Answer 3

Ephoton =hf = hc/lambda

- lambda is upside down y thing

Question 4

What does the f, c, h, and lambda (upside down y) mean in the Ephonton equation?

Answer 4

• f= the photon’s frequency (this can be different for different photons)
• c= speed of light, which is 3.0x10^8m/s
• h=Planck’s constant, which is 6.63x10^34J*s
• lambda= the phtons wavelength

Question 5

What is the speed of light?

Answer 5

3.0x10^8 m/s

Represented by the letter “c”

Question 6

The energy of a photon is directly related to what from Ephoton equation??

Answer 6

frequency

Question 7

The energy of a photon is indirectly related to what from Ephoton equation?

Answer 7

wavelength (lambda)

Question 8

Heisenberg Uncertainty Principle

Answer 8

It is impossible to determine a subatomic particle’s position and its momentum with perfect accuracy

Question 9

Paraphrase Heisenberg Uncertainty principle in understandable English haha

Answer 9

One does not simultaneously determine both the position and momentum of an electron, the more you know the location- the less you know its momentum

Question 10

Photoelectric Effect

Answer 10

If you shine enough energy at a metal plate, it causes the metal plate to eject electrons
-this is how solar panels work (photons from the sun have high enough energy to cause metal plates to eject electrons)

Question 11

Basic definition is electricity?

Answer 11

Flow of e-

Question 12

What has to happen in order for photoelectric effect to work?

Answer 12

1) metal has to be hit with a photon with enough energy. Therefore, the photon must have high frequency and low wavelengths (Ephoton equation)
2) Kinetic energy of an e- must be greater than zero

Question 13

Kinetic Energy of electron equation

Answer 13

Kenetic energy of e- = Ephoton - phi (work function)

Question 14

phi (work function) in Kinetic energy of an electron equation means?

Answer 14

the minimum amount of energy required to ionize (excite) the electron