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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Contributors

Feedback

To determine Planck’s Constant and the work function using the photoelectric effect.

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Which part of the photoelectric experiment helps to determine Planck’s constant?

a: The measurement of emitted heat Explanation

Explanation

b: The plot of stopping potential vs. frequency Explanation

Explanation

c: The intensity of light used Explanation

Explanation

d: The color of the filter used Explanation

Explanation

What is the work function of a metal?

a: The energy needed to create an electric field Explanation

Explanation

b: The minimum energy required to release an electron from the surface Explanation

Explanation

c: The energy required to accelerate an electron Explanation

Explanation

d: The total energy emitted as light Explanation

Explanation

Why do photoelectrons have different kinetic energies?

a: Due to the varying distance of electrons from the nucleus Explanation

Explanation

b: Due to different light colors Explanation

Explanation

c: Because of energy absorbed from light with different frequencies Explanation

Explanation

d: Because of varying light intensities Explanation

Explanation

What does the intercept on the y-axis represent in a plot of stopping potential vs. frequency?

a: The threshold frequency Explanation

Explanation

b: Planck’s constant Explanation

Explanation

c: The work function Explanation

Explanation

d: The acceleration due to gravity Explanation

Explanation

How is the energy of a photon calculated in this experiment?

a: By multiplying the stopping potential by the charge of an electron Explanation

Explanation

b: By dividing the frequency by the wavelength Explanation

Explanation

c: By taking the square of the frequency Explanation

Explanation

d: By subtracting the work function from the total energy Explanation

Explanation

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