Direction of the electric field points
From positive to negative charges(From high to low potential)
discrete spectrum
a spectrum of separate and distinct colors in which not all colors are present
continuous spectrum
the emission of a continuous range of frequencies of electromagnetic radiation
The wavelength is 270 nm. What is the energy changE
1240/270 = 4.59 eV
The potential is 2.8 eV. The wavelength is
1240/2.8 = 442.9 nm
How and why the function of a metal is related to the threshold frequency of light for the photoelectric effect
They are related since the threshold frequency multiplied by Planck's constant is the work function.
Why the V stop is the stopping potential, in terms of the conservation energy
Since no energy can be created or destroyed, this would mean that the kinetic energy is equal to the potential energy. The kinetic energy is found by subtracting the work function from the energy of the photon.
Using the photoelectric equation, given an equation for eV stop vs frequency graph, what is the work function
The work function is the magnitude of the y intercept
Using the photoelectric equation, given an equation for eV stop vs frequency graph, what is the threshold frequency
The threshold frequency is the x-intercept
Using the photoelectric equation, given an equation for eV stop vs frequency graph, what does the slope represent
The slope represents Planck's constant
V stop
The stopping potential of the photon
hf in the photoelectric equation
hf represents the energy of the photon
When the intensity increases, the photons
The photons are released at an increased rate.
When the intensity increases, the electrons
The photons are released at an increased rate.
When the intensity decreases, the electrons
The electrons are released at an decreased rate.
When the intensity decreases, the photons
The photons are released at an increased rate.
When the intensity changes, the speed of photons emitted
Doesn't change
When the intensity changes, the speed of electrons emitted
Doesn't change
Momentum
mass x velocity
mass= 9.11 x 10^-31 kg, speed: 2.70 x 10^6 m/s. The wavelength:
(6.63 x 10^-34 J x s)/((9.11 x 10^-31 kg)(2.70 x 10^6 m/s)) =0.27 nm
absorption spectrum
The range of a pigment's ability to absorb various wavelengths of light.
Emission spectrum
a spectrum of the electromagnetic radiation emitted by a source.
Ground state
The lowest energy state of an atom (n=1)
Excited state
A state in which an atom has higher potential energy than it has in its ground state(n > 1)
Electron energies are negative because
This is because they are attracted to the nucleus
How to find the energy required to ionize an electron, given an electron level diagram
Take the positive value of the eV at the level it is trying to leave
Ionize
To leave the energy level
How to create an absorption spectrum given an energy level diagram
Divide 1240 by each of the wavelengths, then make these values the potential difference between each energy level and n=2.
Predicting which photons will be observed on an emission spectrum
Any potential difference subtracted by excited states or the ground state and the excited state will be emitted
Predicting which photons will be observed on an absorption spectrum
Any potential difference between one of the excited states and one of the ground states
If an electron energy diagram points downward, it
is photon emission
If an electron diagram reaches ground state, it is
Photon absorption
If the potential of the first capacitor is zero and the second one has a negative potential, the V stop is
Positive
If the potential of the first capacitor is zero and the second one is the stopping voltage, how does the kinetic energy of the electrons at the cathode compare to the eV stop
They are equal
Using the photon model of light, how can the effect that changing intensity has on the photons and electrons?
Using the photon model of light, it can demonstrate that total energy does increase with intensity, but not for individual electrons. Also, individually, energy is only increased by changing the wavelength or frequency
Using observation and the experiment, how can the effect that changing intensity has on the photons and electrons?
The electrons and photons being emitted have a direct relationship with the changing intensity.Since the stopping potential doesn't increase, the intensity doesn't impact the stopping voltage or the speed, since the stopping potential and the kinetic energy have a direct relationship
When the wavelength of light increases, the energy
decreases
When the wavelength of light decreases, the energy
increases
When the wavelength of light increases, the interference pattern
increases
When the wavelength of light decreases, the wavelength
decreases