How can Planck's constant be deduced from the graph of stopping potential vs frequency of light...
How can Planck's constant be deduced from the graph of stopping potential vs frequency of light ? How can the work function be obtained from this graph?
Homework Answers
slope = h/e
==> h = slope*e (here e = 1.6*10^-19 C)
y- intercept = -wo/e
==> wo = y-intercept*e (here e = 1.6*10^-19 C)
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How can Planck's constant be deduced from the graph of stopping
potential vs frequency of light...
physics *Error in Planck's constant The slope of the stopping voltage versus frequency graph was found...
physics *Error in Planck's constant The slope of the stopping voltage versus frequency graph was found to be m = (4.36 ± 0.52) x 10-15 Vs. Using this value to determine Planck's constant we obtain h = 6.976 x 10-34Js. Determine the uncertainty in h. Express you answer to 2 significant figures in SI units. Entering numbers in scientific notation: Example: 1.45 x 10-9 should be entered as 1.45E-9
How can we use the y-intercept and the slope from the graph to determine Planck's Constant...
How can we use the y-intercept and the slope from the graph to
determine Planck's Constant and the work function in the equation
KEmax=hf−ϕ ?
(Note: I know the linearization is showing the y-int. and slope to
be zero because the values are so small, but conceptually how could
we do it?)
Max. Kinetic Energy vs Frequen... 2.5x10-19 2x10-19 Max. Kinetic Energy (J) 1.5x10-19 1x10-19 500T 550T 600T 650T 700T 750T Frequency (Hz) Max. Kinetic Energy Curve: y= AX +...
Q1. The diagram shows the graphs of the stopping potential as a function of the frequency...
Q1. The diagram shows the graphs of the stopping potential as a function of the frequency of the incident light for photoelectric experiments performed on three different materials. Rank the materials according to the values of their work functions, from least to greatest 3 stop A. 123 B. 321 C. 213 D. 312 E. 132 Q2. The work function of a metal is 1.8 eV. The stopping potential for electrons ejected from a sample by light of frequency 5x10"Hz is?...
In the photoelectric effect, you got familiar with threshold frequency, stopping potential, and how they are...
In the photoelectric effect, you got familiar with threshold frequency, stopping potential, and how they are inter-related. The wavelength() corresponding to the threshold frequency of potassium is 558 nm. What is the work function for potassium? What is the maximum kinetic energy of e- when light of 400 nm is incident on potassium? If the intensity of light is 10-2W/m², how many photons are incident per second per square meter? (4 points)
In a photoelectric eect experiment, the stopping potential is observed to drop from 5 V to...
In a photoelectric eect experiment, the stopping potential is observed to drop from 5 V to 1 V when the wavelength of incident light is doubled. Determine the work function of the irradiated metal and the frequency of the light in the initial setup.
Compute Planck's constant knowing the work function (phi = 4ev), wavelength of light (lambda = 180nm)...
Compute Planck's constant knowing the work function (phi = 4ev), wavelength of light (lambda = 180nm) and the maximum photo-electron energy KE = 1.6eV.
In a photoelectric effect experiment in which monochromatic light of wave- length, X, falls on a...
In a photoelectric effect experiment in which monochromatic light of wave- length, X, falls on a potassium surface, it is found the stopping potential is 1.91 V for λ-3000 and 0.88 V for λ-: 4000 Á. For these data, calcu- late: a) Planck's constant using e-1.69 × 10-19 C, b) the work function. W, for potassium, and c) the threshold frequency, vT for potassium.
in a photoelectric experiment it is found that a stopping potential of 1.00 v is needed...
in a photoelectric experiment it is found that a stopping potential of 1.00 v is needed to stop all the electrons when incident light of wavelength 294 nm is used and 2.7 V is needed for light of wavelength 207 nm. from these data determine plank's constant and the work function of thr metal.
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light...
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light from a 3 mW laser. How many photons per second are emitted by the laser? 4.0909E15 photons/s Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.00031%. What is the current in the detector assuming all the emitted electrons are captured? пA Note that current is charge(in Coulombs) per second. The charge of one...
Light of wavelength 400 nm is incident on a metal surface. The stopping potential for the...
Light of wavelength 400 nm is incident on a metal
surface. The stopping
potential for the resulting electrons is 0.91 V.
a) What is the work function of the metal?
b) Identify the metal. (Use the Table)
c) What is the cut-off frequency for this target?
76 Chapter 3 Waves and Particles 1: Electromagnetic Radia TABLE 3.1 Metal Work Function in eV) Cesium Potassium Sodium Magnesium 19 2.2 2.3 3.7 are ejected if the intensi surable time might be ne...
How can we use the y-intercept and the slope from the graph to
determine Planck's Constant and the work function in the equation
KEmax=hf−ϕ ?
(Note: I know the linearization is showing the y-int. and slope to
be zero because the values are so small, but conceptually how could
we do it?)
Max. Kinetic Energy vs Frequen... 2.5x10-19 2x10-19 Max. Kinetic Energy (J) 1.5x10-19 1x10-19 500T 550T 600T 650T 700T 750T Frequency (Hz) Max. Kinetic Energy Curve: y= AX +...
Q1. The diagram shows the graphs of the stopping potential as a function of the frequency of the incident light for photoelectric experiments performed on three different materials. Rank the materials according to the values of their work functions, from least to greatest 3 stop A. 123 B. 321 C. 213 D. 312 E. 132 Q2. The work function of a metal is 1.8 eV. The stopping potential for electrons ejected from a sample by light of frequency 5x10"Hz is?...
In the photoelectric effect, you got familiar with threshold frequency, stopping potential, and how they are inter-related. The wavelength() corresponding to the threshold frequency of potassium is 558 nm. What is the work function for potassium? What is the maximum kinetic energy of e- when light of 400 nm is incident on potassium? If the intensity of light is 10-2W/m², how many photons are incident per second per square meter? (4 points)
Compute Planck's constant knowing the work function (phi = 4ev), wavelength of light (lambda = 180nm) and the maximum photo-electron energy KE = 1.6eV.
In a photoelectric effect experiment in which monochromatic light of wave- length, X, falls on a potassium surface, it is found the stopping potential is 1.91 V for λ-3000 and 0.88 V for λ-: 4000 Á. For these data, calcu- late: a) Planck's constant using e-1.69 × 10-19 C, b) the work function. W, for potassium, and c) the threshold frequency, vT for potassium.
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light from a 3 mW laser. How many photons per second are emitted by the laser? 4.0909E15 photons/s Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.00031%. What is the current in the detector assuming all the emitted electrons are captured? пA Note that current is charge(in Coulombs) per second. The charge of one...
Light of wavelength 400 nm is incident on a metal
surface. The stopping
potential for the resulting electrons is 0.91 V.
a) What is the work function of the metal?
b) Identify the metal. (Use the Table)
c) What is the cut-off frequency for this target?
76 Chapter 3 Waves and Particles 1: Electromagnetic Radia TABLE 3.1 Metal Work Function in eV) Cesium Potassium Sodium Magnesium 19 2.2 2.3 3.7 are ejected if the intensi surable time might be ne...
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