Virtual Labs

To determine the Planck's constant from kinetic energy versus frequency graph

How is the energy of the emitted electrons related to the frequency of the LED light used in the experiment?

a: The energy of the emitted electrons is directly proportional to the frequency of the LED light. Explanation

Explanation

b: The energy of the emitted electrons is inversely proportional to the frequency of the LED light. Explanation

Explanation

c: The energy of the emitted electrons is not related to the frequency of the LED light. Explanation

Explanation

d: The energy of the emitted electrons is equal to the intensity of the LED light. Explanation

Explanation

Which of the following properties of the LED light is crucial to accurately determine Planck's constant?

a: The color of the LED light. Explanation

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b: The temperature of the LED. Explanation

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c: The intensity of the LED light. Explanation

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d: The monochromatic nature of the LED light. Explanation

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During the experiment, you notice that increasing the intensity of the incident light does not change the stopping voltage. What can you conclude from this observation?

a: The experiment is flawed, and the intensity setting should be adjusted. Explanation

Explanation

b: The photocell is malfunctioning, and the experiment should be stopped. Explanation

Explanation

c: The stopping voltage is independent of the incident light's intensity. Explanation

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d: The incident light's color should be changed to observe any effect on the stopping voltage. Explanation

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What is the expected outcome when the frequency of the LED light used in the experiment is increased while keeping other variables constant?

a: The number of emitted electrons decreases. Explanation

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b: The energy of the emitted electrons decreases. Explanation

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c: The voltage applied to the photocell decreases. Explanation

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d: The energy of the emitted electrons increases. Explanation

Explanation