# photoelectric effect experiment

See the attached file.

2. In the photoelectric effect experiment, light photons strike a photoelectric material in a phototube and electrons are emitted with a certain kinetic energy. If the stopping energy of the electrons is graphed as a function of the frequency of light, then the slope of the line will be Planck's constant and the y-intercept will be the work function for the material. Construct and document create VI that will read the following experimental data from an Excel file and plot stopping energy of the electrons versus frequency of the light. Also use the LABVIEW linear least squares Sub VI to fit the experimental data to a straight line. From the output of the Sub VI you can get the slope, intercept, and best line to use to determine Planck's constant, the work function, and the theoretical line to graph. Use the Front Panel shown here as a guide for designing your VI..

Wavelength of light (nm) Stopping Energy of electrons (eV)

545 0.50

422 1.10

385 1.50

361 1.70

300 2.40

252 3.20.

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#### Solution Summary

A photoelectric effect experiment is examined and discussed in the solution.

Millikan experiment, Compton effect, photoelectric effect

1. In a Millikan oil drop experiment the terminal velocity of the droplet is observed to be vt = 1.5 mm/s. The density of the oil is = 830 kg/m3 and the viscosity of air is = 1.82 10-5 kg/m s. Use the following equations to find the values below.

Calculate the droplet radius.

µm

(b) Calculate the mass of the droplet.

kg

(c) Calculate the coefficient of friction.

kg/s

12. A gamma ray of 630 keV energy Compton scatters from an electron. Find the energy of the photon scattered at 89°, the kinetic energy of the scattered electron, and the recoil angle of the electron.

keV (photon)

keV (electron)

°

3. What is the threshold frequency for the photoelectric effect of barium ( = 2.5 eV)?

Hz

What is the stopping potential if the wavelength of the incident light is 420 nm?

eV

4. Light from a slit passes through a transmission diffraction grating of 330 lines/mm, which is located 2.2 m from a screen. What are the distances on the screen (from the unscattered slit image) of the three brightest visible (first-order) hydrogen lines?

Red cm

Blue-green cm

Violet cm

3. In a Millikan oil drop experiment the terminal velocity of the droplet is observed to be vt = 1.5 mm/s. The density of the oil is = 830 kg/m3 and the viscosity of air is = 1.82 10-5 kg/m s. Use the following equations to find the values below.

(b) Calculate the droplet radius.

µm

(b) Calculate the mass of the droplet.

kg

(c) Calculate the coefficient of friction.

kg/s

4. Light from a slit passes through a transmission diffraction grating of 330 lines/mm, which is located 2.2 m from a screen. What are the distances on the screen (from the unscattered slit image) of the three brightest visible (first-order) hydrogen lines?

Red cm

Blue-green cm

Violet cm

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